The sizing dies from Dillon and Lee can over size and set the shoulder back too far (on 357Sig) if you screw the sized die down too much. if you have too much headspace you could see a case seperation as the case is worked under pressure during firing.
I use my barrel's chamber to setup the dies for mine also.
Bullet/neck tension is very important as well.
I use my barrel's chamber to setup the dies for mine also.
Bullet/neck tension is very important as well.
