I also use gaugemates 10/12 and I use Black powder in my Brass cases with 4 1/4 dr x 1 1/4 oz with lead and 1 3/8 with Bismuth. 31 gr. 7625 in the cut off Plastics and 1 1/4 roll crimped is a good Duck and game load.Smokeless seems hard to ignite efficiently with fiber wads in the Brass cases.