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Old March 29, 2013, 02:56 PM   #25
Sharpsdressed Man
Junior member
 
Join Date: June 21, 2009
Location: NE Ohio
Posts: 1,176
I'm not even sure it's the polygonal rifling that causes the problem. It very well could be a sharper shoulder at the front of the chamber & case mouth that allows the build up of lead particles/shavings during firing, and then starts to push each next round further back, until the cartridge fires from a less supported breech.
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