I got my new Forster 0.070" SAAMI Field gauge yesterday.
Inserting it without removing the extractor is difficult, it can be done but it's not easy. I hope I'm not harming the chamber with that tool.
Removing the extractor screw can be done but do I feel like damaging the slots on all of them? I have to get some new screwdrivers I guess...If you're at a gun show and want to check a rifle out, I doubt he's going to let you remove the extractor, best learn to do it without that step.
I'm happy to report that all my .303's passed to SAAMI specs. My pretty much unissued 1949 LB was really tight...Information
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