I'd use 1fg in both. Brass hulls are thinner and have a lot of volume. Use the bulkier powder to take up some of that space and reduce the wad column. Also you have to find the proper diameter wads for those hulls. For brass in the 12 ga. I use 11 ga. cards and fiber wads with 1fg. For paper I use 12 ga. wads and cards with either 1 or 2fg depending on the load I want to build. In the 10ga I would use 100 to 110 grs of 1 fg and a 1&1/8 to 1&1/4 oz of shot. For the 8ga? 4 drams 110 to 120 grs of 1fg and 1&1/4 to 1&1/2 oz of shot. ( might be a bit more fun than I'd want to have) Load some up and give them a try. I think you will like them and have some good fun.
