Measure a loaded round and a fired round and post up the numbers, (neck diameter) will make it easier for us to help you. Or measure and call redding, I know I just read in my latest Sinclair catalog the amount undersized you want for spring back etc, I believe it is 2-3 thou smaller than your loaded rounds to gain 1-2 thou neck tension. I'm a FL every time kinda person so I don't know the bushing deal but I have my forster sizing dies reamed .002" smaller in neck than a loaded round. Works great.
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