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.40 caliber .40 in a 10mm .40 S&W 10mm 10mm ammunition 10mm GLOCK Ammo ammunition explosion FBI 10mm GLOCK 20 glock 20 failure glock 20 kaboom glock experiment Handguns

Why I Shoot .40 S&W Ammunition With My Unmodified 10mm GLOCK 20 Pistol

10mm Auto (left), .40 S&W (right) (Image: Jeremy S. for TTAG)
First there was 10mm Auto. The FBI chose a watered-down loading — a 180 grain bullet at 975 fps instead of more like 1,300 fps — and a large-frame Smith & Wesson pistol t…