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That is strange. I have been using the Lee collet for my 308 for over 10 yrs with no problems and even with 10 reloads the brass is good. My loads are not up at the hot end.
With that said, I have seen in my Rem 700 every now and then that the bolt closes a tad bit easier with full size over neck size.
As mentioned above, it would be interesting to see your load data.
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