We shoot 5.56mm IMI 77gr OTM ammunition from an AR15.com AR15 with a 10.5" 1:7" twist barrel into Clearballistics ballistic gel to measure velocity, penetration, expansion/fragmentation, and retained weight.
Penetration: 16.2"
Retained weight: 53.9gr
max expansion: 0.539"
Min expansion: 0.368"
Velocities in fps:
2,472
2,405
2,466
2,470
2,385
Average: 2,439.60
StdDev: 41.38
Min: 2,385
Max: 2,472
Spread: 87
Temp: 82 °F
BP: 30.17 inHG
Altitude: 1,800 feet
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AR15.com AR15 with a 10.5" 1:7" twist
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