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.

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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

««« GUNS IN THIS VIDEO »»»
AR15.com AR15 with a 10.5″ 1:7″ twist

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