I got my brass all prepped and loaded three rounds to set the dies. I used 19.5 grains with a 125 sierra jacketed. Load data on there web site said 18.5 with 110 so im GUESSING a grain more with 297 should be ball park. Youd probably laugh but I don't even have an upper. the two bare lowers and build kits showed up today and it will be at least a month before I can afford the bo upper. They sure are cute little buggers.