40 S&W vs 10mm vs Ballistics Gel
This video compares the ballistic performance of 40 S&W and 10mm using Underwood Ammo 180gr JHP rounds fired from a Glock Gen 4 Model 20. Both calibers penetrated the 16-inch gel block, but the 10mm exhibited significantly more violent expansion and a wider wound channel (0.912 inches) compared to the 40 S&W (0.859 inches). The 10mm also retained slightly less weight (170.5 gr) than the 40 S&W (178.6 gr), indicating greater energy transfer.









