2thdoc,,, I also have a .45 caliber, 42 inch 13/16th GMB, Dickert flintlock. I plink with 45 grains 3fg Goex... Seriously target shoot with 50, 55, 60, and 65 grains of 3fg... I haven't felt the rifle loads unsafe at all... I cut my dovetails for underlugs, rear and front sight's at .080 depth... On a GMB .45 x 13/16 you should have .165 from the outside flat to the bottom of the bore groove... I will add this; when I build another I plan on going only .065 deep with the dovetails... The less metal taken away is always preferable...