![]() The round can cover more yards and keep velocity better than its heavier counterpart. What testing has found is that 5.56mm at 500 yards had a high-velocity thanks to the lower weight of the 5.56mm NATO bullet. Some common grain weight you’ll see for 300 blackout is:īoth 5.56 and 300 blackout have been extensively tested. 300 BLK bullet itself, you’ll notice the size difference of the bullets immediately. Some of the most common grain weights for 5.56mm NATO bullets are: There are different grain weights available for both the 5.56mm and the. Specificationįrom the above table, we can see that both cases have the same overall length. 300 Blackout is a necked-down version of. Both bullets have rimless and bottleneck case types, and both are used in rifles and AR pistols. The casings for both the 5.56mm NATO and. To compare the performance of bullets, we will compare both bullets in all sections that are mentioned below: Since 5.56mm bullets were small, high velocity, and provided good thermal ballistics, so much so that it became the standard bullet that is still used by much of NATO forces. 300 AAC Blackout is a 7.62 x 35mm rifle cartridge that addresses the issues that are long associated with the 5.56mm round. Beat the 5.56m NATO round, achieve better-suppressed sound levels, and rely on the AR-15 platform.300 AAC Blackout Advanced Armament Company (ACC) wanted to achieve the trifecta. The entire premise of the 300 blackout round was to provide a round with better ballistics from a short-barreled rifle. Which, if you can’t tell, is a tall order! Since the MP5SD was 9mm, the end-users, typically Special Forces, needed the 300 blackout to have more power, similar sound suppression, and be AR15/M4 compatible. The premise of the 300 blackout round was to find a round that would be better in a sub-gun, namely the H&K MP5SD, which is a 9mm submachine gun. What’s the best round 5.56 or 300 blackout?.5.56 vs 300 Blackout Terminal Ballistics.
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