Headspace question

[rippit]

How much headspace is too much??

Yesterday the first two shots out of my custom 7saum the case heads separated. This was on brass that had been shot 6 times and full length sized twice. I'm not new to reloading but this is the first time I've ever had a case head separate.
So I decided to check how much my body die is bumping the shoulder back on fired cases . It is pushing the shoulder .025 back

. I thought that seemed like too much so I checked my 243 and it is only bumping the shoulder back .006 when full length resizing.


Does my 7saum have a chamber with too much headspace ?? Causing the cases to stretch too much and separate?

 

[roggom]

.025? should be .002 under a fireformed brass.

 

[rippit]

I know you want to bump the shoulder back for .002 for best accuracy but I think most full length sizing dies will push the shoulder back more than .002. I always have to adjust my die a little off the shell holder to get that .002 bump.