I'll just first and right up front tell you that I am not a big Lee fan, using only a few or their products while avoiding most of them.
Probably an Ol'Coot thing.
As Streach indicates, I can't see any way or reason that your cases would be camfered on a case neck trimmer.
However, what I suspect is happening given that you have used wet/dry sand paper to clean the shaft is -------------- the brass is galing the steel shaft and the build up is what is causing the problem on your case necks.
I have outside turned a lot of .308 brass, necked to .243, and time after time I have needed to clean the brass off the pilot shaft because it started to damage the inside of the case necks. I cleaned the pilot shaft with a piece of #400 or 600 whet and dry paper placed around the pilot shaft as I rapidly cranked the shaft.
I have tried a number of things to solve this and nothing to this point has been completely sucessful.
My outside neck turner is a Forster.
I have also over the years, trimmed many cases to length, in some cases where I was forming brass to another caliber this operation taking a lot of trimming and have never had the problem you speak of. This is with an old RCBS hand turn clase length trimmer.
RCBS makes a much newer trimmer which also has an outside neck turner attachment, but what I have still works, so will probably not replace it any time soon.
Crusty Deary Ol'Coot
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