Used to make some awesome blanks with whatever primer and hull, 30-40 grains of PB and enough Alcan card wads to fill the hull high enough to crimp it. If I remember correctly, it was listed in one of the old Lyman books. Might have been elsewhere, but be careful, since those card wads will be fired out with lethal force at close range. I also wouldn't use it in my prize shotgun. I'd always worry about a card wad getting out of place and causing damage to the barrel. Not likely, but it would still worry me. Shot many hundreds of these things many years ago in an old H&R Single Barrel. Never a problem. I also cut a bunch down to about 2 3/8" for a final length near 2". I used a VERY deep crimp. Even tried them with a roll crimp with success. Those card wads would put a serious dent in a 3/32" Iron plate at 15-20 feet. My neighbor made them to get rid of Blue Jays at 6 AM. I don't know if he hit any with the wads, but the Blue Jays seemed to have moved elsewhere. I thought a 5MM Sheridan was more efficient and a bit more discreet, but to each his own.