For cutting 12 ga plastic hulls down to 2 1/2 inch I use a piece of 3/4 inch pipe squared off in the lathe and measured/cut to the right length.
The measure slips over a 12 ga 3 inch hull (there are lots of freebie hulls out there) and the cut is done with a box cutter. Quick and easy to do up 50 at one time.
For those of you who have not done roll crimped shells before, the roll crimped 2 1/2 inch hull has about the same capacity as a pie crimped 2 3/4 inch hull.
I personally like the hand cranked roll crimper better than the drillpress crimper.
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