extractor ring

Guys, my problem is nothing special. I've bought older XCR Gen 1 rifle in 338 RUM. I have some Federal cases from factory ammo and new unused Remington cases. The Federal's bottom of the case measures around 0.533", no problem with it. It flies nice far out by repeating. The bottom of the Remmy...

So, I'm sure this is a common issue. I've done a bit of searching, but haven't come up with anything. The claw extractor on a recent acquisition of mine is suffering from inadequate spring tension. I think the extractor ring might actually be the problem. It deforms easily and doesn't remember...