I sort brass...
mostly for accuracy in rifle loads... but in cases like semi auto 9mm, I've seen extreme differences in flash hole diameters... right or wrong, if I'm mixing my brass, I uniform the flash hole size, so that I get consistent accuracy, & pressure curves... each factory ammo may function fine, in my gun, but they use different powders, & primers... some extreme big or small may not function reliably in my gun, with my chosen powder & primer, so I uniform as much as possible & find a load that functions & shoots well, with sorted brass or uniformed primer pockets & trimmed to uniform case lengths, I can count on my loads
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