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I would fire form some cases blowing the shoulder forward and then reload as normal being carful not to push the shoulder back where it was.

Ken

Headspace 101 for .303's

Several generations of American shooters have been convinced by bad information that something mysterious and scary called "headspace" should be checked and re-checked on...

Jim,
I had forgotten about the "O" ring trick. You are right , that would work very well!

Ken

If you are a handloader you could always load some fire forming rounds by loading a bullet in the lands of the rifling to hold the case against the bolt face and then fire form. These cases would...