Chuck R.
Member
Working with my newly re-barreled 300WM and I'm getting 0.020" average headspace expansion on new FED brass using a Hornady comparator and taking 10rd samples.
New brass just had the necks sized, no shoulder bump.
AVG Measurement for new brass was 4.264"
AVG measurement for once fired is 4.284"
I've got the whole "belted mags headspace on the belt for their 1st firing thing, then headspace off the shoulder" thing. I'm trying to save some of the stretching on that 1st firing.
Question is, how many of you guys have done the false shoulder using a .32" or .33" expander, and has it done any good at limiting the thinning above the belt?
New brass just had the necks sized, no shoulder bump.
AVG Measurement for new brass was 4.264"
AVG measurement for once fired is 4.284"
I've got the whole "belted mags headspace on the belt for their 1st firing thing, then headspace off the shoulder" thing. I'm trying to save some of the stretching on that 1st firing.
Question is, how many of you guys have done the false shoulder using a .32" or .33" expander, and has it done any good at limiting the thinning above the belt?