I have found that a 1/8" nitro card on top of the 16 ga. fiber filler eliminated the dished crimps. The fiber filler is somewhat compressable and the nitro card on top allows for some crush in the column and has eliminated dished crimps and buckling at the crimp. Since the powder charge is so low I'm not worried about a tiny increase in pressure. Also the added nitro card helps with preventing shot embedding in the fiber cushion. Works with either the Red Dot or the SR4756 load data. Now all my shells look really nice, like factory crimps.
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