Most primers have about the same pressures. Cheddite, Win, Fiocchi and Rem. are all about the same, within a hundred or two for pressure. The Federal are usually quite a bit hotter. Crimp depth has a greater effect on pressure. Factory shells have about .050 to .060 and that is what is used for reloading data. Going down to .020 or up to .080 will change pressures by 1 to 2000psi. Paul
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