Charlie have you tried putting a bit of lubrication such as Vaseline on the case mouth before you try to roll crimp the case? I put a touch of lube on every second or third case and it sure smooths out the crimp.
Fishtale you can use the same load data in your roll crimped shells but you may have to cut down the hull a bit. Try trimming your 12 gauge hulls to 2 5/8th inches and your 16 and 20 gauge hulls to 2 9/16th inches. If you don't want to mess with trimming your hulls and your gun has 2 3/4 inch chambers just put 4 - 5 grains of puffed wheat or rice on top of your shot to act as a filler.
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