10mm vs. .357 mag ballistic gelatin test

A

Andrew Wiggin

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.357 180 gr XTP video link

.357 mag Prograde 180 gr XTP fired from 4" barrel S&W Model 13 through four layers of denim into calibrated gelatin.

BB: 600.4 fps, 3.7"

Impact velocity: 1,078 fps
Penetration: 22.4"
Retained weight: 179.5 gr

No expansion.



10mm 180 gr XTP video link

10mm Hornady Custom 180 gr XTP fired from 4.5" barrel EAA Witness through four layers of denim into calibrated gelatin.

BB: 600.4 fps, 3.7"

Impact velocity: 1,261 fps
Penetration: 15.9"
Retained weight: 176.8 gr
Max expansion: 0.761"
Min expansion: 0.583"

Sorry, but I experienced an operator induced malfunction on one camera and missed the side shot of the gelatin.




Okay, in all seriousness, that really isn't a fair comparison. Sure it's the same bullet weight and sure it's almost the same barrel length but we don't measure revolvers the way we do autos. It's also a VERY heavy weight for .357, while it's middle of the road for 10mm. The .357 load was probably intended for use in a much longer barrel. I intended to test it in my wife's .357 Rossi M92 but I only had two rounds and the first exited the side of the block.



Bonus happy fun time with Desert Eagle, levers, and 37mm
 
Thanks for the info. I think the XTP is a good performer in "real" 10mm loads. I've seen data on Gold Dots which expanded very well but did not penetrate enough because they were shot at higher velocities than the bullet was designed for.

On the other hand, the 1,078 fps velocity on the .357 is pretty mild for a magnum load. The XTP seems to be designed for higher velocities than Gold Dots. A Gold Dot at that velocity would probably have expanded reasonably well with adequate penetration.

More proof that there's no such thing as a "magic bullet."
 
Take a look at my YouTube channel. I've tested several 200 gr 10mm loads, including XTP and Black Talon, and several 158 gr .357 loads, including XTP and Gold Dot.
 
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