There are a number of bullets that can have a point blank range of 200 yards in a .50 Cal. muzzleloader. Problem is that many of the light bullets don't shoot well with the magnum charges. If I was looking to do what you want to do here, I would look at the 250 grain T/C Shockwave (or SST - whichever you gun likes best) - ahead of a charge capable of driving it to 2,000 fps. I use 130 grains of Pyrodex pellets - but some of the loose powders can get there as well. I want to try some BM3, but so far can't find any locally and don't want to pay the HazMat charge to get some from Cabela's.