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I use magnum primers exclusively in my .357 Magnum loads but standard primers in my .40's because that's how I worked up my loads.
I also don't see an issue with using them as long as you work up your loads from the start and as always, keep an eye out for pressure signs.
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Four Rugers, three SIG Sauers, assorted rifles. NRA, GOA and SAF Life Member.
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