First up the Lee 459-500. It's the most accurate bullet in my 45 caliber CVA. About 0.5" at 50 yards. Boolit holds enough lube to splash the crown on the way out. It shoots best with 65gr of home made screened going 976fps and making 1062ft/lbs.
The other good boolit is the Lee 457-450F which actually weighs about 466gr with pure lead. It shoots about an inch at 50 yards with 90gr of screened going 1084fps or 1213 ft/lbs. More energy and flatter nose, but it doesn't hold enough lube and so far not as accurate. I do have plans to revisit this boolit with higher charges.
So, does it matter which one, or is one better suited for Bambi? I've shot a lot of deer, but never with a muzzle loader and never with this combination of speed weight and softness.