Ballistic Gel Testing
We fired 5-rounds of this Underwood Bonded 180 Grain 10mm ammo through a 4-layer fabric barrier and into ballistic gel. Using a Glock 29 (3.78" barrel) we noted an average penetration depth of 13.38" - just a hair shy of the Federal Bureau of Investigation's recommended 14" - 18" window. These rounds did fare very well in terms of expansion - coming in at .74" on average for our 5-shot sample. Take a look below to see more comparisons against other 10mm ammunition options for self-defense.
Unfired versus Fired Round Comparison
|20rds – 10mm Underwood 180gr. JHP Ammo Gel Test Results|
|Bullet Depth (in.)||12||12.1||13.4||13.5||15.9|
|Expanded Diameter (in.)||0.71||0.72||0.73||0.75||0.79|
|Expanded Weight (gr.)||176.9||177.7||178.5||179.2||180|
|Bullet Velocity (fps)||1171||1173||1176||1176||1194|