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I just did a post on some primer test I ran and won`t re post the whole thing again here. BUT, short version is sometimes. I think it has to do with the powder case size and barrel lenth. With some powder there was no difference. With others there was a great deal and with 1 load I started showing presure signs with standard primers lond beforeI saw presure with mag. primers. I have found the smae with accuracy, some times no difference and others a great deal.
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