Hornady 10mm 155-grain XTP JHP
D
x = 0.7353 ± 0.0005" (scanned area; computed diameter)
M = 155.7 grains
V = 1,320 fps
Test Pistol: Glock 20SF 4.61-inch barrel
Barrier: Four layers of cotton denim, 16-ounce/yard²; IWBA protocol
Temperature: 74° F
Humidity: 43%
Penetration Depth Modeling
mTHOR algorithm (Schwartz, 2014): 10.68 inches
Q-model (Schwartz, 2012): 10.13 inches
WTI (MacPherson, 1995): 11.09 inches
UTSI (Peters, 1990): 10.05 inches
US Army BRL (Sturdivan, 1973): 10.41 inches
Average computed penetration depth: 10.47 inches
Total Wound Volume: 3.55 in³
While the computed maximum terminal penetration depth is a bit shallow at approximately 10½ inches, the overall performance of the Hornady is excellent given that it was driven beyond the upper boundary (1,300 fps) of its designed velocity window. Pushed beyond the upper velocity boundary any bullet can, and will, fail often spectacularly with fragmentation and disintegration. The XTP performed well in spite of the excessive demand placed upon it.