Sometimes the issue can be the shell extractor catching on the edge of the brass or steel collar on cheap low base shells.
If if you are finding that is not the issue and the problem is encountered just before lockup (ie: breech not closing fully) then it is the rim recess.
It could just be packed with crud and need to be cleaned or even very lightly recut with a rim cutter to allow the shells to fully seat.
There was a difference in rim profiles 100 years ago as compared to today.
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B. Dudley
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