300 blk vs 556

The .300 BLK also reaches peak ballistic potential from a 9-inch barrel..30 Cal and 5.56 Suppressors. The 5.56 requires a 20-inch barrel to reach peak ballistic performance..300 Blackout vs. 5.56 NATO Strengths Weaknesses. Both .300 BLK and 5.56 NATO are intermediate-class rifle cartridges for target shooting, hunting, home defense, and plinking. tottenham vs as roma