John, the Hardin Crimp is created with a standard crimper with an eight sided starter, not a roll crimper. The advantage of the Hardin Crimp is that you don't have to fool with a roll crimper. The Hardin Crimp, as Dave posted, is not an aggressive crimp, does not increase pressure over a similar load with another type of crimp. However, some loaders like to seal a Hardin Crimp with a sealer or wax to insure that the shotload stays in place under recoil from several discharges of the opposite barrel.
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