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It seems to make a difference in the 41 magnum. I don't know about semi auto rounds. I had far more RP so I have winowed out the old WW cases.
I loaded 9mm for a while and store bought was as accurate as my loads and low cost.
If you are shooting for gun, I would not worry. If you want serious accuracy, then its worth the possibility and if you really want consistency, buy Starline or a top brass and keep it. It just depends on how much you are willing to pay.
My 45 Long Colt (yea I know, two of my old loading books say long colt) no range pickup for that so I got Starline loaded in 45 LC and then bought a 100 more cases.
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