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With the advent of more efficient smokeless powders, less length of hull was needed to contain the powder because less powder volume could accomplish the same or better results than black powder. Therefore, more hull was available for sealing the shell. The over-shot card could be dispensed with and the final quarter-inch of standardized paper or plastic shells was simply folded over toward the middle. Today’s final crimp depth is about 1/16-inch with either a six- or an eight-segment fold. Hevi-Shot shells were originally marketed with a roll-crimp, but with Remington’s partnership they have since switched to the more conventional eight-fold.

Is there a difference between the six- and eight-segment folds? Except for the number of leaves or folds, no, but it is believed that the eight-segment fold holds a little tighter and is therefore a little better for smaller shot, #7-1/2, #8 and #9 in target and small game loads. There is a tendency for the six-fold to be used with larger shot in hunting and field loads. The small shells used in the 28-gauge and the 410 use a six-fold. Although it seems counter-intuitive, the large shells of a 10-gauge also use a six-fold crimp, perhaps because they are heavy hunting loads.