Case Rim Expansion - 6.5 Saum

[gut_pile]

Primer pockets both measure .209 on fired and unfired brass

 

[Bob Wright]

I don't own any DBM's but I'm curious to know why the sheet metal body of the mag is that close to the rim diameter. .005 clearance is not what I would think is reliably functional. If it's the feed lips then that would be the problem to be solved. With the shell holder issue, there are others to try. Borrow a buddies?
Lastly, I would try sanding some of the rims to clean up any burrs from extractors etc. and retry those in the mag and shell holders.

 

[can1010]

the saum brass has a rebated rim it never comes close to the feed lips on any mag i have seen.

 

[243winxb]

Recently I have began reloading with brass that has been fired one time. I am running into an issue where the rim of my brass is expanding and my brass will no longer go into my DBM and sometimes won't even go into the shell holder.

What could be causing this?

High pressure- These cartridges run right on the edge of 75,000 psi. where brass will no longer spring back, after firing.

Soft brass may be another issue.

Buy new brass. Load less powder.

 

[Phil Rizzo]

I can't help but think the brass is suspect.
Definitely measure a bunch of "new" cases to start with.

Especially if the pockets aren't changing diameter.?

 

[BrentM]

I had to slightly open up my shell holder opening for the Sherman improved PRC brass to fit.