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Yes, I think thats probable, Im actually looking at the set with the competition seater die as well as a set for the 308W.

Gunsmithing &Reloading Tools - Redding Type S Neck Match Die Set, Dies
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Lee Collet Neck Sizing Die Part 1 - YouTube

Some grease on the collet worked wonders...that and more pressure on the lever was far tighter, full is tigher still though.

I might just have a go at that....but I usually find shipping costs makes it pointless.

I did several cases and got a similar result each time. For instance full sizing and then neck sizing on the same case should not have differed? as if there is any neck issues its common to that one...

Yes did all that at least twice, I might try and borrow a mate's press or drive to the club's and check on their one see if I get the same result. Until now Ive been using the club's lyman full size...

I did some tests out of curiorosity.

So 4 once fired same make cases, same batch.

So std un-sized once fired case, lose on lee neck sizer mandrel, to be expected (case A).

Neck sized...