FredC wrote on Jun 1^st, 2020 at 7:29pm:

We had another member have a similar problem with go and no/go gauges. You are correct the go gauge should be smaller and fit where the no/go might not. Need to ask are they from the same manufacturer? Maybe one has a larger bevel then the other. Going out on a limb for the original problem singe fed rounds chamber, magazine fed do not. If the magazine cut off selector for feeding single rounds is not in the rifle it can really scar the rims when feeding from the magazine. Maybe the deformed rims do not chamber? If so get the selector or build a mock up out of a nail.

Yep both gauges are from clymer, the go guage doesnt have any bevel on it but the no-go does. Both guages look identical except for the bevel.

Don't think I have a cutoff selector, I think it was removed in order to fit a sight. The rounds will ride from the magazine just fine but the bolt just wont close due to the extractor not riding up the bevel on the cartridge. If I put the cartridge underneath the extractor it chambers just fine.

The rims are very scared though like you said but I think thats from the extractor.