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Old March 4, 2013, 09:31 PM   #4
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 4,826
In my own tests with cleaned and uncleaned primer pockets in loads used for 1000 yard matches, cleaning them makes test groups change about 1/10th of an inch at that range. Sometimes bigger, other times smaller. Too darned hard to measure with any decent level of credibility. So I quit cleaning fired case primer pockets.
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Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master
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