Modern Sporting Rifle Evolution
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RichM

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Reply with quote  #1 
I uniform all my flash holes since it keeps me out of the pub [rolleyes].   I really don't know if uniforming the flash hole has really increased my consistency, but i figure it can't hurt. 
What are others experience? 

I'm talking a Lyman or RCBS tool not just hogging out the flash hole with a 5/64 drill bit (sadly I've seen similar to this on range scrounge brass).
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Airaddict

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Reply with quote  #2 
I usually break down and do it. You only need to do it once and if it helps, then so be it. I havent noticed a difference between brass i have done it for opposed to brass on rifles i havent.
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RangerJoe

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Reply with quote  #3 
I do the same. I've reloaded 10s of 1,000s of rounds of US GI brass over the years, along with a good amount of commercial stuff.  I've found flash holes so badly burred and/or so malformed, that without uniforming them - there is no doubt that those rounds would have been flyers. Admittedly, that is a few out of 1,000s... but when chasing those sub-MOA groups, it has to help.
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