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I was testing a 50 round box of the Underwood 9mm +P+ 115 gr in my CZ P-01. One round did not chamber properly, and was lodged in the receiver. This is an unusual occurrence, it never happened before in this gun. I did some research, and measured the overall length of several brands. To my surprise the underwood rounds were considerably shorter than the other brands. Perhaps the shorter rounds combined with the hollow point bullet are prone to catching on something. And also, maybe the way that underwood is getting that 1400 fps speed, is by putting the bullet farther into the casing. See table below. The underwood round is almost 2mm shorter than the speer gold dot (these are using the exact same bullet).
length in mm of various 9mm rounds
speer gold dot 28.57
underwood (speer gold dot bullet) 26.75
freedom munitions (ball ammo) 29.25
speer blazer (ball ammo) 29.20
snap cap 28.40
thanks, Chris
Portland OR
length in mm of various 9mm rounds
speer gold dot 28.57
underwood (speer gold dot bullet) 26.75
freedom munitions (ball ammo) 29.25
speer blazer (ball ammo) 29.20
snap cap 28.40
thanks, Chris
Portland OR