Join Date: Oct 2010
Location: Smack Dab in the middle of God's Country! Saskatchewan, Of Course!
the issue with FL resizing is you squeeze the body down first, pushing the shoulder forward, then the have a tight hold on the body, and push the shoulder back.
the theory is, brass will slowly move to the neck/shoulder area causing seating/chambering issues
and that brass has to come from somewhere, but I don't think it is from the case head area, but more mid to upper body
one of the die makers had an excellent article on this, and it explained why my buddy's tight chambered 300WM wasn't able to chamber FL resized cases. 1F and new chambered fine. we ground a hint off the bottom of the FL sizer and problem solved. He didn't want to just neck size, as this was his hunting gun.
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