I do do reloading for some of my rifles, would you need to fire form them?
I do do reloading for some of my rifles, would you need to fire form them?
Are you asking about 303Brit cases resized to 7x57R?? NO, the die will size them for you, but you're going to have to trim the case mouths to length.
Once you've shot them, they will be fireformed to be perfect for your chamber and then you only need to neck resize…..
Easy to form from 303 brass.
View attachment 611540
Rather than full-length resizing, I resize the neck just a bit at a time until the rifle just barely closes on the resized case. That way you will not have any headspace issues.
Ted