If the primer's anvil inside the cup is a little soft or the primer is not fully sensitized or seated home the firing pin can stretch the cup past what it likes and that can cause a pierced primer. ...
Type: Posts; User: No.3
If the primer's anvil inside the cup is a little soft or the primer is not fully sensitized or seated home the firing pin can stretch the cup past what it likes and that can cause a pierced primer. ...