I just looked up a half dozen "You Tube" videos and the absolute "best" groups shown would be where I'd "start"! Not for me, thanks. I shoot a Bad Bull (smokeless powder) muzzleloader with 140 G of IMR 4350! Shoots 1 ragged hole! (Of course, it's cost prohibitive but groups to 300+ yards)!
Hope this helps, Capt. Chris