Next to the original 5.56mm NATO/223, the 300 AAC Blackout (BLK for short ... me that my Mossberg doesn’t particularly care for heavy bullets, and that trend held true with the 1.5-inch groups ...
300 blackout, and 7.62 rifle rounds that have ... 7.62 x 39mm. It is a VERY HEAVY bullet and travels over 2000 feet per second and will glide right through bulletproof vests that police wear ...