Subsonic 300 blackout

Subsonic 300 blackout DEFAULT

Ballistic know-how combined with modern technology makes 300 Blackout ammo the go-to for seasoned shooters and marksmen. This centerfire ammo, also referred to as 300 AAC Blackout, is best known for its superb performance and versatility. Thanks to its incredible accuracy, the 300 Blackout round is tried and true to be one of the most versatile loads on the market.

Great for target shooting, hunting, and tactical applications, 300 blk ammo is the high-performing low-recoil answer to bulky and cumbersome cartridges. Additionally, there's also 300 Blackout subsonic for fans of suppressed fire. Comparing it to other rifle ammunition, 300 Blackout is a cross between popular military rounds like 5.56mm and 7.62mm.

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HUSH 300 Blackout 220 gr HPBT New

HUSH 300 Blackout 220 gr HPBT New

The 300 Blackout cartridge (often referred to as 300 AAC, 300 AAC Blackout, 300 BLK or simply Blackout) was designed and developed to be used in suppressed firearm platforms utilizing a 220 grain projectile. The 300 Blackout has proven itself over the last decade to be an effective means for taking thin skinned game cartridge when used at ranges of 100 yards an in. Due to the lower velocities produced by the 300 Blackout, expansion will not be as pronounced but the reduction in decibels is obvious when compared to 300 Blackout cartridges loaded with lighter bullets. Our HUSH 220 grain subsonic ammunition is set up for suppressed AR-15 rifles but is also well suited for bolt action or single shot rifles as well.

For best reliability in semi auto platforms, we recommend the use of a suppressor in combination with this ammunition.

Average Velocity: 950 Feet Per Second (FPS)

Tested Barrel Length: 16 inches

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.300 AAC Blackout

Rifle cartridge originally designed for use in the M4 carbine

7.62×35mm/300 AAC Blackout
Five bullets.jpg

The .300 AAC Blackout plastic tipped, left, compared to .300 AAC Blackout 125 gr match, .300 AAC Blackout 220 gr subsonic, 5.56×45mm NATO, and 7.62×39mm.

Place of originUnited States
Parent case.221 Fireball/.223 Remington
Case typeRimless, bottleneck
Bullet diameter0.308 in (7.8 mm)
Neck diameter0.334 in (8.5 mm)
Base diameter0.376 in (9.6 mm)
Rim diameter0.378 in (9.6 mm)
Case length1.368 in (34.7 mm)
Overall length2.26 in (57 mm)
Rifling twist1-8″ (203 mm)
Primer typeSmall rifle
Maximum pressure (SAAMI)55,000
Maximum pressure (CIP)56,565
Maximum CUP52,000 CUP
Bullet mass/typeVelocityEnergy
125 gr (8 g) OTM2,215 ft/s (675 m/s)1,360 ft⋅lbf (1,840 J)
220 gr (14 g) OTM1,010 ft/s (310 m/s)498 ft⋅lbf (675 J)
78 gr (5 g) Lehigh Defense CQ2,800 ft/s (850 m/s)1,358 ft⋅lbf (1,841 J)
90 gr (6 g) Barnes OTFB2,550 ft/s (780 m/s)1,300 ft⋅lbf (1,800 J)
110 gr (7 g) Hornady Black V-MAX2,375 ft/s (724 m/s)1,377 ft⋅lbf (1,867 J)
Test barrel length: 16 in

The .300 AAC Blackout (designated as the 300 BLK by the SAAMI[1] and 300 AAC Blackout by the C.I.P.[2]), also known as 7.62×35mm, is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine. Its purpose is to achieve ballistics similar to the 7.62×39mm cartridge or, even more similarly, the 7.92×33mm Kurz cartridge in an M4 while using standard M4 magazines at their normal capacities. Ammunition in .300 BLK cannot be used in a rifle chambered for 7.62×40mm Wilson Tactical.[3] It is mainly derived from the .300 Whisper concept, but differs in having been submitted to the SAAMI.


While 5.56×45mm NATO has enjoyed widespread acceptance in military circles, the nature of the missions encountered by some special operations groups often demand a round that provides better performance than that available in the high-energy, standard velocity rounds, and subsonic performance greater than standard 9mm (the ubiquitous pistol and submachine gun) round.[4]

To meet this demand, AAC developed the 300 AAC Blackout in cooperation with Remington Defense. The new cartridge was intended to negate many of the perceived drawbacks inherent to other large caliber cartridges used in the M4. Colt Firearms and other arms makers had previously chambered AR-pattern rifles and carbines in various .30 caliber rounds but encountered problems. In the case of the 7.62×39mm, its relatively severe case angle caused feeding issues unless specially modified AK-47 magazines were used, and even then results were unsatisfactory.[citation needed] Modified bolts were also needed owing to its larger case head diameter. Rounds such as the 6.8 SPC and 6.5 Grendel had similar parts-interchangeability issues but did allow for the use of the standard M4/M16 30-round magazine, albeit with a reduced capacity.[5]

300 AAC Blackout rounds shot from a suppressed M4 carbine

Wildcat cartridges such as the .300 Whisper series addressed these issues, but their widespread use in single shot handguns and lack of industry standard cartridge dimension meant that a great number of the popular loads on both the supersonic and subsonic end of the spectrum were less than ideal in the AR pattern weapons. Many of these rounds required an excessively long overall cartridge length that would prohibit feeding in a STANAG magazine while using powder charges that were not compatible with the pressure requirements of the M4 carbine. This was particularly noticeable when using subsonic ammunition in conjunction with a suppressor as short stroking and excessive fouling would occur similar to that which was seen in the earliest variants of the M16 in Vietnam.[6]

By keeping the M4/M16 in mind as the primary host during load development the designers could work up a host of cartridges that not only satisfied the ballistic requirements set forth, but also ensured mechanical reliability with the fewest changes to the weapon itself—with only a simple barrel change necessary for complete conversion.[7]

Robert Silvers, director of research and development for AAC said, "We started development in 2009, but most of the work was done in 2010. A military customer wanted a way to be able to shoot .30-cal. bullets from an M4 platform while using normal bolts and magazines, and without losing the full 30-round capacity of standard magazines. They also wanted a source for ammunition made to their specs. We could not have just used .300-221 or .300 Whisper because Remington is a SAAMI company, and will only load ammunition that is a SAAMI-standard cartridge. We had to take the .300-221 wildcat concept, determine the final specs for it, and submit it to SAAMI. We did that, and called it the .300 AAC Blackout (.300 BLK)."[8]

300 AAC Blackout was approved by SAAMI on January 17, 2011.

On October 23, 2011, SSG Daniel Horner of the USAMU used 300 AAC Blackout to win his fourth USPSAMulti Gun National Championship.[9]

Military use[edit]


In July 2015, the Netherlands' Defense Material Organization issued a tender for 195 carbines chambered in 300 BLK on behalf of the Dutch Maritime Special Operations Force (NL-MARSOF). The intention was to purchase ball, subsonic, and lead-free frangible cartridges representing the first formal military adoption of the .300 AAC Blackout.[10] In December 2016 the NL-MARSOF acquired 195 integrally suppressed SIG MCX carbines fitted with a new folding stock developed for use with ballistic visor helmets chambered in .300 AAC Blackout becoming the first publicly known military user of the cartridge.[11][12]

United Kingdom[edit]

On 14 July 2017, the UK Ministry of Defence issued a tender for a five year (plus five years optional) contract to supply .300 Blackout supersonic and subsonic small arms ammunition. Also noted was the fact that the ammunition type had already been in use.[13]


Example of a .300 AAC Blackout shot in a block of gel

Supersonic ammunition muzzle velocities and muzzle energies by barrel length:

Barrel Cartridge Velocity Energy
9 in (230 mm) barrel 300 AAC Blackout, 115 gr UMC 2,120 ft/s (650 m/s) 1,136 ft⋅lbf (1,540 J)
16 in (410 mm) barrel 300 AAC Blackout, 115 gr UMC 2,295 ft/s (700 m/s) 1,344 ft⋅lbf (1,822 J)
9 in (230 mm) barrel 300 AAC Blackout, 110 gr TTSX 2,300 ft/s (700 m/s) 1,310 ft⋅lbf (1,780 J)
9 in (230 mm) barrel 300 AAC Blackout, 110 gr VMAX 2,350 ft/s (720 m/s) 1,350 ft⋅lbf (1,830 J)
9 in (230 mm) barrel 300 AAC Blackout, 125 gr OTM 2,030 ft/s (620 m/s) 1,143 ft⋅lbf (1,550 J)
16 in (410 mm) barrel 300 AAC Blackout, 125 gr OTM 2,215 ft/s (675 m/s) 1,360 ft⋅lbf (1,840 J)
20 in (510 mm) barrel 300 AAC Blackout, 78 gr Lehigh Defense CQ 2,880 ft/s (880 m/s) 1,436 ft⋅lbf (1,947 J)
24 in (610 mm) barrel 300 AAC Blackout, 78 gr Lehigh Defense CQ 2,960 ft/s (900 m/s) 1,517 ft⋅lbf (2,057 J)
20 in (510 mm) barrel 300 AAC Blackout, 90 gr Barnes OTFB 2,630 ft/s (800 m/s) 1,382 ft⋅lbf (1,874 J)
24 in (610 mm) barrel 300 AAC Blackout, 90 gr Barnes OTFB 2,710 ft/s (830 m/s) 1,468 ft⋅lbf (1,990 J)

The 300 AAC Blackout was designed to achieve energies similar to the 7.62×39mm Soviet in an AR-15 while using standard AR magazines at their full capacity. The 7.62 Soviet's cartridge taper prevented reliable feeding in AR magazines and created wear on the bolt. From the 14.5 in (370 mm) barrel of the M4 Carbine, the M855 5.56×45mm round has an effective point target range of 500 meters. The bullet has significant drop, drift, and energy loss at that distance. From a 16 in (410 mm) barrel, a 125 gr (8.1 g) 300 BLK round has a lower velocity and similar bullet drop and drift at shorter distances. However, it has the same amount of energy at 700 meters that the M855 has at 500 meters. In terms of hit probability, the Blackout has an effective range of 460 meters. From a 9 in (230 mm) barrel, the 125 gr BLK round has the same muzzle energy as the M855 from the M4, and 5 percent more energy at 440 meters. In comparison with 7.62×39mm rounds, 300 BLK rounds with varying loads have a better ballistic coefficient and more energy out of similar length barrels. 300 BLK rounds like the Barnes TAC 110 grain, have "barrier blind" performance, being capable of penetration through several inches of different hard targets. 300 BLK allows a user to have one firearm with the capability of switching between subsonic, supersonic VMAX or barrier penetrating ammunition all with just the change of a magazine. It is able to replace the H&K MP5 for close quarters, and with just a magazine change, bring the fight to longer distances, outperforming the M4 carbine.[citation needed] The .30 caliber cartridge has an 89.1 percent increase in frontal bullet area over the 5.56×45mm, and so leaves a larger wound cavity in soft targets. It also penetrates deeper and initially yaws faster. 300 BLK rounds are effective out of barrels as short as 4.5 in (110 mm). Weapons chambered for the round can be as light, compact, and quiet when suppressed as submachine guns like the 9×19mmMP5, 5.7x28mmFN P90, and 4.6×30mmMP7 while having more energy and accuracy at longer range.[14][15]

Round Weight Barrel length Muzzle velocity Range for 100 in (2.5 m) of bullet drop Range for 41 in (1.0 m) of bullet drift Range for 291 ft⋅lbf (395 J) of energy Effective range
M855 5.56×45mm 62 gr (4.0 g) 14.5 in (370 mm) 2,900 ft/s (880 m/s) 500 m (550 yd) 500 m (550 yd) 500 m (550 yd) 500 m (550 yd)
300 BLK 125 gr (8.1 g) 16 in (410 mm) 2,220 ft/s (680 m/s) 440 m (480 yd) 484 m (529 yd) 700 m (770 yd) 460 m (500 yd)
300 BLK 125 gr (8.1 g) 9 in (230 mm) 2,050 ft/s (620 m/s) 410 m (450 yd) 470 m (510 yd) 625 m (684 yd) 440 m (480 yd)
Round Weight Barrel length Muzzle velocity Ballistic coefficient Energy at 300 meters
7.62×39mm 123 gr (8.0 g) 16.5 in (420 mm) 2,396 ft/s (730 m/s) 0.280 712 J (525 ft⋅lbf)
300 BLK 115 gr (7.5 g) 16 in (410 mm) 2,295 ft/s (700 m/s) 0.300 777 J (573 ft⋅lbf)
300 BLK 125 gr (8.1 g) 16 in (410 mm) 2,220 ft/s (680 m/s) 0.320 829 J (611 ft⋅lbf)

Compared to the 6.8×43mm Special Purpose Cartridge, another round made to have increased stopping power over the 5.56 NATO, the 300 Blackout has different capabilities. The 300 BLK was designed with a specific shorter-range focus to have equal or more energy than the 7.62 Soviet and work reliably with suppressors. The earlier 6.8 SPC was simply designed to have more energy at all ranges than the 5.56×45mm. It has a relatively small projectile with a high velocity that maintains performance at range. At 200 yd (183 m), the 300 BLK drops 2 in (51 mm) lower than the 6.8 SPC, while it drops 30 in (760 mm) lower at 500 yd (457 m). The 115 gr (7.5 g) 6.8-round has a higher muzzle energy of 1,694 ft⋅lb (2,297 J) due to its greater velocity, while the 125 gr (8.1 g) 300 BLK round has a muzzle energy of 1,360 ft⋅lb (1,840 J). Both rounds were made to be used in an easily converted AR-15. The 6.8 SPC has a more difficult conversion because it was designed around the obsolete .30 Remington cartridge, requiring a different bolt and decreasing standard magazine capacity. The 300 BLK was made specifically for ease of conversion, so the standard bolt will work and a magazine can be used to its full capacity, so the only change needed is the barrel & gas system.[16]

Potential hazards[edit]

AR-15 rifle with dustcover and magazine band that identify it as having a chambering of .300 AAC Blackout

The very advantage of the 300 BLK (its similarity to the popular .223/5.56 caliber) can also be a safety issue if ammunition of the two calibers is mixed. Because of similar chamber dimensions between the two calibers, SAAMI has listed the combination of using a 300 BLK round in a .223 chamber as unsafe.[3] Since the bullet of the 300 BLK is larger than the bore of the .223 caliber, chambering and firing causes excessive pressure to build up since the bullet has nowhere to go, which can cause the rifle to explode resulting in risk of injury or death. Since the mix up can easily be done, some suggest owners of firearms in both calibers carefully separate firearm and ammunition of the two types by, for instance, clearly marking the firearms and magazines, and visually inspect every round while loading magazines.[17] Whether a 300 BLK cartridge actually is able to chamber in a .223 barrel depends on bullet length and shape, bullet seating depth, crimping, and the volume of powder charge. Ideally, cartridges would use one of the longer projectiles, a case-filling powder charge, and have the projectile crimped into place.


  • Pioneering work by the USAF Armament Lab at Eglin Air Force Base in the late 1960s produced the 7.62×28mm cartridge, which propelled a 172 g match projectile to about 1,050 ft/s (320 m/s) but suffered from various reliability issues.[18]
  • More recently, popular wildcats such the .300-221, 300 Fireball, and JD Jones's proprietary version of them, the .300 Whisper, advanced the concept.[19] The .300 AAC Blackout is a SAAMI-standardized .300-221. Hornady states that any rifle chambered for the 300 AAC Blackout can shoot their .300 Whisper ammunition, which is made within .300 AAC Blackout specs. The reloading dies for these two cartridges are often the same.[8]

See also[edit]


  1. ^"American National Standard Voluntary Industry Performance Standards for Pressure and Velocity of Centerfire Rifle Ammunition for the Use of Commercial Manufacturers"(PDF). SAAMI. November 8, 2017. Archived from the original(PDF) on March 28, 2018. Retrieved November 8, 2017. 300 BLK SAAMI drawing (page 110)]
  2. ^ or 300 AAC BlackoutC.I.P. TDCC sheet 300 ACC Blackout
  3. ^ ab"Technical Data Sheet - Unsafe Firearm Ammunition Combinations"(PDF). SAAMI. Archived from the original(PDF) on March 29, 2018. Retrieved November 26, 2018.
  4. ^"Infantry: Big Bullet Blues". Strategy Page. February 2, 2007.
  5. ^Lee, Jerry (August 12, 2013). Gun Digest 2014. Iola, Wisconsin: Krause Publications. pp. 114–116. ISBN .
  6. ^"L. James Sullivan Interview". Small Arms Review. 2001.
  7. ^Cooke, Steve (January 2012). "The Ultimate Battle Round?". Recoil. 1 (1).
  8. ^ abJohnson, Steve (November 5, 2012). "Shades of Gray: .300 Whisper & .300 AAC Blackout". American Rifleman. Retrieved December 30, 2018.
  9. ^Curtis, Rob (October 23, 2011). "USAMU's Horner takes the gold with 300BLK". Army Times. Archived from the original on October 26, 2011. Retrieved December 30, 2018.
  10. ^Wilk, Remigiusz (July 2, 2015). "Dutch special forces to buy carbines chambered in 300 BLK". Janes Defence. Retrieved July 4, 2015.
  11. ^Wilk, Remigiusz (November 24, 2016). "SIG MCX rifles delivered to Dutch special forces". IHS Jane's 360. IHS Jane's Defence Weekly. Archived from the original on November 9, 2017. Retrieved November 8, 2017.
  12. ^"Dutch MARSOF officially purchase .300 BLK SIG MCX Rifles". The Firearms Blog. December 9, 2016.
  13. ^"Prior information notice for contracts in the field of defence and security supplies". European Union Tenders Electronic Daily. July 14, 2017. Retrieved July 25, 2017.
  14. ^"300 AAC Blackout Ammo". Mid America Munitions.
  15. ^Silvers, Robert. "300 AAC Blackout Low Visibility Carbine"(PDF). Advanced Armament Corp. Archived from the original(PDF) on April 30, 2013. Retrieved October 20, 2013.
  16. ^Leghorn, Nick (September 24, 2012). "6.8 SPC versus 300 BLK?". The Truth About Guns. Retrieved December 30, 2018.
  17. ^Brown, Jason J. (September 1, 2016). "Avoiding the .300BLK AR-15 'ka-boom!'".
  18. ^Ordnance Magazine, September–October 1970
  19. ^Barnes, Frank C. (October 5, 2012). Cartridges of the World: A Complete Illustrated Reference for More Than 1,500 Cartridges. Iola, Wisconsin: Gun Digest Books. pp. 436–437. ISBN .

External links[edit]


300 Blackout: Shooting with Subsonic Ammo

One of the hottest new rounds to emerge in the past few years is 300 Blackout; this is a true dual-purpose intermediate sized cartridge that can be fired in both subsonic and supersonic loads. It was designed to be used in AR-pattern rifles with only a barrel change to convert a traditional AR-15 rifle from 5.56 NATO. It has since become one of the most popular rounds to use with a suppressor.

This relatively new cartridge has been around a bit longer than some might think and has its share of fans and detractors, but 300 Blackout has more than proven itself as a hunting, defensive and target round in that time. It may not be the be-all and end-all cartridge, but for most shooters and hunters, 300 Blackout is worth taking a second look at.

Want to skip ahead in the guide? Use the links below:

Table of Contents

What is 300 Blackout Ammo?

The 300 Blackout round has its roots in the 300 Whisper cartridge designed by JD Jones of SSK Industries in the early 1990s. Jones formed the brass from 221 Fireball cases expanded to take a .30 caliber bullet. By varying the load, lighter bullets could be fired at supersonic levels with the power of the Soviet 7.62 x 39 or used with heavier bullets at a subsonic level for use with a sound suppressor.

Unfortunately, the round was trademarked by SSK and other manufacturers were unable to manufacture barrels or even brass and dies for the round. The 1994 Federal Crime Bill and Assault Weapon Ban did not help the subsonic cause, either, as threaded barrels on semi automatic rifles made them subject to the ban. National Firearm Act laws governing the sales of silencers were also misunderstood at the time and silencer ownership was a mere sliver of what it is today.

It seemed as if the round was doomed to die in the “also-ran” wildcat category until the Federal Assault Weapon Ban was allowed to sunset in 2004 and a company called Advanced Armament Corporation (AAC) began to show interest in the 300 Whisper.

AAC was eventually bought out by Remington Defense and the two companies worked on the design as a potent new caliber that could address perceived shortcomings with the 5.56 NATO round.

Remington and AAC changed the design slightly by using trimmed and expanded 5.56 NATO brass as opposed to 221 Fireball or 222 Remington as the parent case. They normalized different load data and submitted the new cartridge to SAAMI (Small Arms Ammunition Manufacturers Institute) and CIP (Permanent International Commission for the Proof of Small Arms) for standardization and christened the new round 300 AAC Blackout by CIP and 300 BLK by SAAMI.

The improved design means that it will work with a standard AR15 or M16 bolt and magazines with the only real part change being the barrel. Another positive note is that 300 Blackout and the original 300 Whisper cartridge are completely interchangeable from barrels to reloading dies as well as reloading components and specifications.

As a result of its popularity we have even seen the retail price of 300 Blackout ammunition decrease over time. This is always a good sign with regard to the longevity of an ammunition cartridge in the market.

Performance and Ballistics

In its standard form as a subsonic round, 300 Blackout most closely resembles the 7.62 x 39mm round first used in the SKS and AK-47 rifles of the former Soviet Union. In its subsonic loading it has been compared with both subsonic 9mm and 45 ACP.

One of the main reasons that the US Military was looking for a replacement round for 5.56 NATO was the loss of energy and velocity by the 5.56 NATO round as it was fired through barrels that were increasingly getting shorter.

The 5.56 round was developed for use in 20” barreled rifles. Severe deficiencies were found when trying to make the military service rifle shorter. Additionally, the use of a suppressor dictated going to a shorter barrel as soldiers were finding full sized rifles becoming unwieldy with a 5” to 8” sound suppressor mounted on the muzzle. Another consideration here was the effect of the initial blast of unburnt powder and flash increasing wear on the initial baffle of a 5.56 suppressor.

300 Blackout was optimized to be fired through shorter barrels and even in supersonic loadings it did not have that initial blast problem. The round exceeded most military expectations for the caliber in both subsonic and supersonic renderings.

On the civilian side, 300 Blackout has proven to be a performer in the field for hunting and on the competitive shooting circuit.


Popular Comparisons

Every new cartridge is often compared to an older one and 300 Blackout is no exception. These comparisons are both a good thing and a bad thing for a few reasons.

On the good side, hunters and shooters generally want an idea of how a new round will perform. Comparing 300 BLK to an existing round with regards to bullet weight, caliber, velocity and energy sets the stage.

So the 300 Blackout supersonic loads are compared to rounds such as 30-30 Winchester and 7.62 X 39mm. This gives a shooter an idea of what to expect recoil wise and the intended use of the round.

Another consideration for rifle shooters is often the size of the rifle’s action. While this was addressed initially by use of 300 Blackout in the AR-15 or M16 platform with regard to bolt face, magazine configuration, etc, it is also an important consideration for use in a bolt action rifle.

For the bolt action rifle shooter, action length is often an important consideration, as this can affect the weight of the rifle and its overall configuration for handling recoil. Typical bolt action lengths are referred to as short, long and Magnum. The long action is used for rifles chambered in calibers such as 30-06 Springfield. Magnum actions are intended for powerful belted magnum cartridges such as 300 Winchester Magnum, 459 Winchester Magnum or 375 Holland & Holland. The short action is intended for everything from 17 Remington up to 308 Winchester and this is the size needed for a bolt action rifle chambered in 300 Blackout.

The subsonic 300 Blackout loads are often compared to 45 ACP, 10 mm or 9mm subsonic rounds. This showcases the dual purpose of the round. The advantage of 300 Blackout is if the shooter wants an AR-pattern rifle or pistol that is easily suppressed, they can use a common magazine and typically only need to swap an upper receiver. Pistol caliber conversions for the AR platform often need different magazines, buffer assembles and other changes to make them effective and reliable.

Where it becomes a bad thing is that these comparisons rarely give the complete picture to the shooter or hunter and can actually be a disservice to 300 Blackout and to the round to which it is being compared.

300 Blackout vs. 556

The most obvious comparison for 300 Blackout will be made with 5.56 NATO. After all, this is the round it was intended to dethrone.

As we stated earlier, this is a disservice to both cartridges. The 5.56 NATO round has a longer range, higher velocity and some would say more inherent accuracy. In its supersonic loading, 300 Blackout shares similar characteristics with the 7.62 X 39mm round which has often been set up as the rival of 5.56 NATO for the past 60 years.

Terminal ballistics for both rounds as a military cartridge will be compared ad nauseum. A lighter bullet in the form of 5.56, by as much as two to 3 times the weight, travelling at 75% to 100% of the velocity has its advantages over the heavier and slower 300 Blackout. Yet some troops would say that a heavier and slower bullet may not have the penetration ability of the 5.56 but addresses the overpenetration issues noted by US Army Rangers and Infantry in operations in Somalia where the 5.56 required multiple hits on target to dispatch an enemy soldier, whereas the 7.62 x 39mm seemed more effective at stopping an enemy combatant with a single round.

One of the dangers of keeping both rounds in the same collection is that 300 Blackout will actually chamber in a 5.56 rifle. It cannot be safely fired from that platform without causing a catastrophic failure to the firearm and injury or possibly death to the shooter and those in close proximity.

For this reason, we recommend that if you shoot both calibers to incorporate some variables with regard to your shooting components and accessories. For example, use one type or color of a magazine for one round and a different one for the other. This can be taken a step further by loading 300 Blackout subsonic rounds in a different magazine size from the 300 Blackout supersonic rounds so that a supersonic round does not accidentally go through a pistol caliber or 300 BLK subsonic rated suppressor accidentally.

The key advantage here is that AR magazines are inexpensive when compared to just about every other platform out there. This is another inherent advantage of 300 Blackout.

It is not a bad idea to ensure that the upper receivers can be easily distinguished, whether by different optics, rails or colors.

300 Blackout vs. 350 Legend

When 350 Legend debuted, Winchester claimed it was the fastest straight wall cartridge ever released. Like 300 Blackout ammunition, it had the ability to be loaded to subsonic or supersonic levels and it would fit in a standard AR15 action and magazine. Some hunters speculated that it would sound the death knell for 300 Blackout due to the fact that hunters in some north eastern and midwestern states were limited to hunting deer with a straight wall cartridge.

As fine a cartridge as it is, 300 Blackout had the advantage in that it had more than a 10-year head start on 350 Legend. There are simply more barrels, magazines, rifles, pistols and other accessories dedicated to 300 Blackout as opposed to 350 Legend.

350 Legend certainly has the upper hand as a hunting caliber in states where bottleneck cartridges are prohibited for big game hunting and performs well on animals like deer and black bear, but it will not overtake 300 Blackout on the whole anytime soon.

The other disadvantage is the limited amount of .35 caliber suppressors made for the supersonic load in 350 Legend. Subsonic 350 Legend can be safely fired through most 9mm suppressors in the same manner as 300 Blackout subsonic.

300 Blackout vs. 223

While 5.56 NATO and 223 Remington are used interchangeably, they are not the same round. The 5.56 NATO is loaded to a higher pressure level than 223 Remington. Furthermore, 223 Remington is considered a commercial civilian use round, making it more suitable for hunting applications, not unlike the 300 Blackout supersonic load.

In this regard we often see more soft point, hollow point and general use hunting rounds in 223 Remington as opposed to 5.56 NATO. However, 223 Remington is considered more of a small game or varmint round, as opposed to a heavier round like the 300 Blackout.

Again, it goes back to the purpose of the round and shows how a long range varmint round, as was the original intent of 223 Remington, cannot be justly compared to a slower, heavier bullet like the supersonic 300 Blackout. 223 Remington is ideal for coyotes and prairie dogs at long range whereas 300 Blackout is more suitable for deer or black bear at shorter ranges.

Shooting 300 Blackout Ammo with a Suppressor

As we mentioned numerous times by now, 300 Blackout has a subsonic range of ammunition choices and makes for an excellent suppressor host. The advantages are two-fold in that if one sticks to strictly subsonic loads they can shoot through a suppressor rated for 45 ACP or 9mm. Should the shooter wish to shoot the supersonic round suppressed, a silencer rated for 308 Winchester will easily handle both supersonic and subsonic loads.

300 Blackout subsonic is one of the quietest rounds to suppress, particularly when fired through a closed breech firearm like a bolt action or single shot rifle. There is no noise from the action or any created via the ejection process as noticed in a semi automatic firearm.

Additionally, we find 300 Blackout in supersonic form to have a very mild and pleasant tone when fired through most suppressors rated for 308 Winchester. It may not be as quiet as a 300 BLK subsonic, but sometimes absolute silence is not the goal.

Is 300 BLK good for Hunting?

The 300 BLK round is an excellent cartridge for hunting. Ballistically it performs similar to 7.62 x 39 or maybe the great American hunting round known as 30-30 Winchester or 30 WCF (Winchester Centerfire).

300 BLK has one distinct advantage over 30-30 Winchester in that 300 Blackout can use more effective Spitzer type bullets, where this is a rarity in most rifles chambered in 30-30 Winchester due to the use of a tubular magazine found on most lever action rifles chambered in 30-30 Winchester..

Likewise, 300 Blackout is a superior hunting round to 7.62 X39 because most 7.62 X 39mm ammunition is Berdan primed and steel cased and therefore non reloadable. Plus, 300 BLK has many more options with regard to bullet choices more suitable for hunting.

300 Blackout for Deer Hunting

Although it may not look like it at first glance, 300 BLK makes an excellent choice in a cartridge for deer hunting. There is a wide variety of factory ammunition and reloading components to make this an excellent short range deer slayer.

They key is to run the 300 BLK with supersonic loads and an appropriate projectile. This will allow for proper penetration and expansion and a marked level of improved performance when it comes to terminal ballistics. Simply put, the 220-grain subsonic loads will not give you that performance on a deer.

Another consideration is range – we find the 300 Blackout perfectly acceptable for taking deer within 150 yards. Performance is quite similar to the 30-30 Winchester, only we feel it is a more accurate round with much better projectile options for terminal ballistics on big game.

Closing Thoughts

300 Blackout is at the very least a very interesting and diverse cartridge for the shooter, hunter and especially a home reloader. Its dual purpose gives it a very distinct role in both personal defense and shooting sports. 300 Blackout seems to have become a mainstream round in the past decade alone, despite its origins in the 1990s in the form of the 300 Whisper wildcat type of round. As a subsonic suppressor host or as an intermediate hunting caliber, we expect to see 300 Blackout stay around for at least another half a century.


300 blackout subsonic

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Subsonic .300 Black Out vs. Kevlar Body Armor

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Be seen and go out to feed the children, and get ready to go for a walk with them. Passing the mother-in-law's room, the door was open and I could hear that she had children, I looked in to say hello and saw that my beloved mother-in-law was standing in. A thong and trying on a bra.

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