I have three loads for my 45 Colt revolvers, 9.9 grs of Accurate No. 5, 7.4 gr. of Unique and 7.3 gr. of HP-38. If I point the muzzle up, and then bring it down to shoot, I get between 700-750 FPS out of the three loads. If I lower the muzzle of the gun, then raise it to shoot, the velocity is 100-200 FPS lower. I realize its caused by very little smokeless powder in a big case designed for black powder. Is there a way to fix this problem besides using Trail Boss which is impossible to find? Are there any other position insensitive powders?