The old .303 rounds I used to shoot 45 years ago were much larger in diameter than modern boxer primers. I never did any thing special in regards to cleaning afer using old surplus rounds and it never seem to affect the rifle. My son has it now and shot a 5 shot 1 inch group at 100 yards with the old gal before this years deer hunt. It will shot several different handloads into 2 inches
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Murf
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