March 6th, 2017, 03:54 PM
Join Date: Oct 2006
Location: Chesterfield, VA
I can see where a dent/gouge in the crown in just the right spot - so that it affects a land or maybe even a groove exactly at the exit of the barrel could affect a bullet. At least it wouldn't surprise me.
I have two .357 SIG pistols. A Glock M31 and a S&W M&P FS. The ammo that shot (as decent as a Glock will shoot) alright in my M31 tumbles like a lopsided football in the M&P, even at 8 or 10 yds. People told me to get the muzzle recrowned so I did. No effect. It still tumbles those rounds. Now some it doesn't tumble, but the M31 shot all of them (couple different loads with 124 grain hollow points) without tumbling.
Funny stuff sometimes. If you don't understand exactly what is wrong then what you do to fix it might help, or it might not.
I used to work for a big chemical company. When the process went south several knobs would get turned. When the process straightened out again no one was ever interested in trying to figure out which knob turning helped and which knob turning had no effect. Science. Gotta love it.