I'd try the Power Belt Aero 275 Grain bullet. Shoots great out of my CVA Optima Pro. I would also try the new Blackhorn 209 powder. This stuff is truly amazing. I've used every black powder out there and there is nothing like it. Period. I had a great muzzleloader tag last year and killed a great bull at around 90 yards and this load crunched him. The only thing that sucks is I didn't recover the bullet. I got some comments from some people that a 45 cal is too light for elk, however, just like anything shot placement is the key. My gun was used by my buddy's kid on the same hunt 2 years ago and he also killed a great bull....bottomline, close to 700 inches of antler, with 2 shots from a 45 cal. Ed