9 MM Barrel Twist Questions
Not sure where to post this so I thought here first. Last Friday I was shooting pistols at the local range. I had a S&W Model 39 and a Beretta Model92. I was shooting at 15 yards in the off-hand position. All the m39 hits were in the 10 ring. The Beretta hits were key-holing. I was using a 147 grain round nosed bullet and 3.5 grains of Bullseye using a CCI Small pistol primer. Trying to figure out why the key-holing. Barrel twist? Best guesses are welcome.
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USMC 69-93 Combat Pistol Inst.
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