In another thread flash hole deburring was mentioned. The only test I have seen on the practice was in by Litz ( is he the only one that actually tests these theories ?) and he found that if you are using brass with punched flashholes not drilled deburring produces a significantly lower SD of velocity but any chamfering of the flasholes resulted in a increase in SD (Modern Advancements in Long Range Shooting) Tony Boyer in his book on Rifle Accuracy is skeptical on the usefulness and points out that after the initial firing any burrs are flattened anyway.
I take the safe route and never use virgin cases at a match or in testing and let the primer deburr the flash hole on the first firing. I do uniform primer pockets however. I have see variations in all brands including Lapua and want my primers seated to the same depth so I take a few minutes to do so.
Just curious as to who does what to the primers and flasholes and why? Any links to actual testing data would be wonderful
I take the safe route and never use virgin cases at a match or in testing and let the primer deburr the flash hole on the first firing. I do uniform primer pockets however. I have see variations in all brands including Lapua and want my primers seated to the same depth so I take a few minutes to do so.
Just curious as to who does what to the primers and flasholes and why? Any links to actual testing data would be wonderful
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