Steve has it, fresh factory shell, run the crimp die down until it touches. Use it as a starting point with your shell. Go for too little crimp, no "mushroom" then gradually increase until it's right.
It helps to mark your crimp die somehow. On a P-W I use a label maker, run a tape with hash marks around the die. That way I can see how much I am adding or taking away from the crimp as you adjust the die. 1/8 turn-2/8 turn 3/8 turn etc. otherwise it's possible to go too much, not enough, never hitting the right spot. The right spot may be as little as 1/16 turn. It's a fine line.
William
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Threaded Mode