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Hi, TDB4,
I agree with those advising that reloads that are not close to mil spec can cause problems in an M1.
Even with GI ammo, though, some M1s will eject the case in such a way that the neck is dented.
Sometimes it is only a matter of replacing the ejector and/or extractor springs.
Sometimes, the cause is the ejector itself. You may need to replace the ejector or change the angle of ejection by stoning its face. The latter is nearly impossible to describe and is somewhat trial and error, so you best have an spare ejector anyway if you try to work on it.
The extractor can also affect the ejection angle, and it may need replaced.
It takes quite a dent in a case neck to prevent cases from being reloaded, though. Usually, the expander plug is small enough to enter the neck and if it is not, the plug can be ground slightly to make a sharper point (do not grind on the expander ball, only on the guide part). Still, it is better to fix the denting problem than to deal with it in reloading.
Jim
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