Can More Be Less? CORBON .223 77gr MPR (TMK) 20" Barrel Gel Test
The 77gr Tipped Matchking from Sierra is one of the most highly regarded bullets available in .223 or 5.56 for defensive use. But a viewer expressed concern that maybe this bullet wouldn't penetrate as deeply if it were moving faster. So we're going to fire a 77gr Sierra TMK from my 20" Colt AR-15 A2 into calibrated 10% ordnance gelatin.
10.5" Test: https://www.youtube.com/watch?v=aq50cOGSXcY
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Penetration: 9.5"
Retained weight: 26.4gr
Max expansion: 0.554"
Min expansion: 0.349"
Velocities in fps:
2,782
2,782
2,782
2,752
2,450
2,737
Average: 2,714
StdDev: 130.8
Min: 2,450
Max: 2,782
Spread: 332
#arfcom #musket #tmk
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