For about 10 years all I used were Cheddite primers and just used data for Win or Rem primers - they're all so close , especially at mild pressures, it doesn't make any difference which one you use. I have now gone to just Win primers because two of my old SxSs, a Parker and Remington hammer gun, both pierce Cheddite primers. They seem to have a different material used in the primer. I don't feel like paying a gunsmith to make new firing pins.
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Paul Harm
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