separate operation using universal depriming tool first , then all prep work .... lube inside and out , then size all brass.... tumble all the lube off
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size the case full length as you normally would , pull the brass out until its gets freed from the neck squeezing portion of the die , bring the ram down just until you feel it wanting to start sizing the outside of the neck again, then, adjust the expander up until it either touches the brass or stops ((if your die stops first it will not do this function)) . if , you can touch the brass pull the brass out and lift your expander up just a little more (( you decide )) . essentially, overlapping the 2 sizing functions of the same die.
annealing before this operation will really reduce the felt resistance ,
you will stop feeling that area in the middle of the sizing operation where the brass isnt touching anything