I neck size 2/3rd's of the length of the neck (only cause this is what the guy who taught me to reload 30 years ago did)
I also Bump the shoulder back very minimally every time I reload. Just enough so the case will chamber easily.
When loading for my 6.5TCU I used to get a lot of stuck cases as the rim would peel off. Was soft winchester brass. Changed brand of cases and a very nice forum member polished the die within an inch of its life and no more issues. TCU is a very straight walled case which I think means resizing is more difficult.
not sure if any of that will help.




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