BrokenWheel
Member
I have a possum hollow trimmer that trims 223 brass, using the datum line of the shoulder of the casing as its reference point. I've set it to 1.750" but some bass after trimming measures up +/- .004" (usually on the + side though). The brass are a variety of different head-stamps, but I thought using a full length re sizer die should bring them all into the same dimensions.
Currently, after the PH trimming, I finally trim the brass exactly to 1.750", using a hand crank Lyman trimmer. This last step makes processing brass more time consuming. So I thought, isn't the case length measured from the datum line a more realistic measurement since it mimics what happens in the rifle chamber? Could someone tell me which trimming procedure is correct?
If so that would save me a step...
Currently, after the PH trimming, I finally trim the brass exactly to 1.750", using a hand crank Lyman trimmer. This last step makes processing brass more time consuming. So I thought, isn't the case length measured from the datum line a more realistic measurement since it mimics what happens in the rifle chamber? Could someone tell me which trimming procedure is correct?
If so that would save me a step...