While the above question was from years ago, I didn't see where anyone had answered it. So, here goes. There are tools made that are attached to micrometer calipers that will measure from the base of the cartridge case to a datum line about mid way up the case's shoulder. Measure the cases before sizing, then adjust your die so that the shoulder is only pushed back by 2-3 thousandths. I watch the ring of case lube as the lube gets squeegeed down the case neck by the sizing die to tell me how close the part of the die that contacts the case's shoulder is to the case.