Yes, I've seen a difference. I only load small caliber/varmint stuff these days but I remember load testing and running out of CCI BR4 primers. I picked-up some CCI 400 primers reluctantly, loaded only a few..and found the results changed a bit. I don't remember it being an accuracy change so much, rather, a POI change. I stopped using them, and just tried harder to find BR4s...and stocked-up when I did.
Anecdotal...but that's my experience.
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