Nor must you conclude Federal primers tend to be more potent. Tests clearly show Federal rifle and pistol primers have about the same Strength as other brands. Pierce analyzed a bunch of primers with distinct powders and recorded the results that he called combined. Option of powder and primer combos. https://lukasegfbz.tribunablog.com/the-2-minute-rule-for-federal-large-rifle-magnum-match-primers-46313301