I simply color in the primer with a RED sharpie after priming / loading. I do this mainly with 9x18 brass I trimmed from 9mm Luger.
After picking up my brass, during sorting, the colored primer stands out and I can easily distinguish it from 9x19. Should I miss one and somebody else takes the casing, the colored primer should raise a brow to them that the round has been reloaded...left behind...it's RED (caution)..and should they miss it, should they go to reload it as a 9x19, well...it should be obvious to anybody paying attention.
Reformed rifle cases I don't generally mark (284 to 7.5 swiss / 270 to 7.7 jap) as it is obvious to me and bolt brass doesn't get lost.
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