Let's keep this simple. That short barreled rifle will not burn "magnum" charges of powder efficiently. Additionally you don't need those kind of loads to take deer, bear or even elk. Get some .530 round balls, a pre-lubed .015 patch (or .018 ticking, doesn't matter) and charge with 60 grains (volume measure, not weight) of 3F powder. I have never had a .54, and I have a few, that doesn't shoot accurately with that load. If you want, go as high as 70 grains to get a few more fps, if your rifle shoots it accurately. I find it unnecessary, as deer just die quickly and cleanly with the load mentioned. In 48 years of muzzleloading, I have never used a combo of platypus milk, mink oil, nor Ballistol, as a patch lubricant. I've done ok, I reckon, and my guns barrels are pristine after 4+ decades of use. But hey, it's a free world, go crazy with exotic concoctions if that is an attractive option for you! I actually used an Investarms "Hawken" this year to get a nice buck, using the exact load I described. Dropped in his tracks at 65 yards, don't see the need for more "power".