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New Glcok 20 owner here and I was recently at a gun show here in California. I noticed a bulk ammo booth that did not recomend Armscor 10mm ammo for Glocks. Any body have any experience with this ammo for Glock 20's 
Underwood Ammo makes some excellent 10mm offerings. TNoutdoors9 on YouTube has quite a few ballistic tests to show of it.I shoot my G20 some. It is hard on brass and the ejector is tough on the rims. Not sure why? The 10mm is a beast. I was considering it for my CCW weapon in G29 frame, until I started testing some JHP ammo. I have not found a JHP bullet that will stand up to the 10mm except the Hornady XTP and they penetrate like mad. I'm talking 30 inches of water and then thru the bottom of a steel barrel and buried in the dirt so deep I can't find them. 10mm is sort of like the 41/44 mags. good dangerous critter gun, but not at all suited for CCW.
In those tests the bullets fragment due to the increases velocity, and I think that it what he was talking about.Underwood Ammo makes some excellent 10mm offerings. TNoutdoors9 on YouTube has quite a few ballistic tests to show of it.
The 180 grain did pretty well. I'll agree I wasn't a fan of the lighter weightsjimmyalbrecht said:In those tests the bullets fragment due to the increases velocity, and I think that it what he was talking about.