Thread: Deformed Rims

Originally Posted by flock

Have been giving a quick touch up with a fine file, usually just a small but persistent bur that cause the grief, no problem firing them without a touch up but I'm in the habit of checking them with wilson gauge for head space, one in 15 always causes a problem, doesn't fully engage.

https://forum.accurateshooter.com/th...uence.3906096/

Thanks for the link @flock,
I don't think that the rim deformation is due to hot loads. Any load hot enough to expand the rim is nuclear hot and would likely expand the primer pocket beyond further use or worse. I have had the problem with .223 brass in my M700. The problem was traced to tight cases from neck sizing being shaved by the extractor. Some of the shavings got behind the extractor and caused problems until they were cleaned out (thanks Jeremy). The rifles chamber is tight and the standard CH full length die produces cases with the right amount of chamber bump so I could have saved myself the trouble. The cases were only ever fired in the M700 so the problem was not from a previous rifle. Cases for my T3 .223 are sized with the + .002 Redding shell holder ant these chamber tight in the M700.
Regards Grandpamac.