I load 300 Win Mag, 264 Win Mag, 338 Lapua Mag, 458 Win Mag and 450 3 1/4" NE with the Federal 215 primer (large rifle mag). I prefer the M for match, but Lapua ammo company doesn't use the match primers. The 215 is the "Hottest" small arms primer in the world. That isn't the answer you ask for, but it is the primer you should be using!
Ivan
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