I don't think there is any way to do a roll crimp using a PW 375. There is a process using what is called a Hartin crimp where by you trim the hull to 2 1/2 (I prefer 2 9/16th) inches run through the normal loading process until you get to the crimp start station. You then put an over shot card on top of the shot, crimp start and crimp in the normal fashion. The end product is a short shell with a partial star crimp with the shot being retained by the overshot card. I personally don't use this process opting for the traditional roll crimp. Do a search on 16ga.com reloading forum and as I remember there are photos posted of the final product.
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