Dultimatpredator
Well-known member
So, I grabbed a different brand brass cases that I just annealed about a month ago and then FL sized I’m my standard 243 die with it turned down a quarter turn past flush.
I took three of these cases and ran them through my SB 243 die leaving the case turned up where I had it sizing my federal case shoulders at 1.625”. I ran all three frontier cases through the SB die and measured. All were 1.624”. I turned the up approx another 1/2”of a turn and ran the same cases that measured 1.624” through my die again.. All three case shoulders grew to 1.625”. So learned a lesson, if i run them through my SB FL sizer and make them too short for headspace clearance I still can make my case shoulders expand and grow again if I turn my die up more. I figured when I pushed the shoulders down I would not be able to get them to stretch again till firing and would have to deal with the shorter headspace cases. This explains why when i size a case and then when I run it through the sizer there is still some felt resistance from spring back.
I took three of these cases and ran them through my SB 243 die leaving the case turned up where I had it sizing my federal case shoulders at 1.625”. I ran all three frontier cases through the SB die and measured. All were 1.624”. I turned the up approx another 1/2”of a turn and ran the same cases that measured 1.624” through my die again.. All three case shoulders grew to 1.625”. So learned a lesson, if i run them through my SB FL sizer and make them too short for headspace clearance I still can make my case shoulders expand and grow again if I turn my die up more. I figured when I pushed the shoulders down I would not be able to get them to stretch again till firing and would have to deal with the shorter headspace cases. This explains why when i size a case and then when I run it through the sizer there is still some felt resistance from spring back.
Last edited: