Win, Rem, Cheddite and SOME CCI primers are all what would be called mild. Fed and some CCI's are what would be called hot. I use Rem hulls - there are so many laying at my club and all of them reload the same. The Federal and I believe the Cheddite [ not sure ] are a straight wall hull and should use a wad meant for them. The Remington and Winchester are a tapper hull and use a different wad. I know Claybuster claims some of their wads can be used in either and yet they make wads for each. The tapper wad will fit a straight wall hull, but it doesn't seal as good as the wad intended for a straight wall hull. After looking at some of my reloading manuals a change in mild primers could change pressures by as much as 2000psi. After talking to Claybusters awhile back I feel safe useing Cheddites in place of Winchesters. Just my opinion, take from it what you will.
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Paul Harm
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