AAC 5.56 With 77gr Sierra MatchKing HPBT: Better Than The Military's MK262?
The AAC 5.56 NATO load with a 77gr Sierra MatchKing bullet shows promising performance, comparable to military MK262. Tested across 10.4-inch and 16-inch barrels, it achieved velocities of 2,274 FPS and 2,564 FPS respectively. Ballistic gel tests revealed significant fragmentation and wound channels, meeting self-defense criteria and FBI penetration standards.







