I used IMR powder 800-X, 18gr. Please, check that on the IMR powder booklet. Used, Rem.RXP wads in a Fed. plastic hull, Rem.209P primers and 7/8oz. of shot. These were to give 7600 psi and a fps of 1210 according to the book. I tried to use the Hartin crimp and unless I cut the hulls I little longer, it wouldn't work for me. Besides the roll crimp looks so cool, but the Hartin crimp is so fast to load, if it works for you. I used an over shot card for a 24ga. muzzleloading shotgun.