Once you figure it out, I believe you'll get the most enjoyment from shooting patched round balls. 58 caliber round ball will really pound an elk!
If your bore is good and you're accuracy suffers, it's almost always the patch.
Locate your fired patches, and if they're blown to shreds that's why your accuracy is suffering.
Pillow ticking and a short starter is your friend. 015" is what I use in everything. But measuring patch thickness is something of an art not science. So it's the thickest ticking Joanne sells.
I can shoot anything from 45 grains all the way to 120gr from my 58 Cal with lead round balls. Wheel weights don't work with heavy charges because the ball won't obturate so it blows a patch every time... even with a really thick over powder wad.
I use an Napa (water soluble) cutting oil+distilled water on my patches and can shoot for hours without wiping or cleaning.
Folks seem to love to parrot the phrase "you gotta find what your gun likes"...Silly. My rifles "like" to be pointed at the target when they go off. And if the patch holds, they hit every time. Doesn't matter brand, type, or amount of powder... (except don't expect too much from Pyrodex).
Go look at the boys that shoot our monthly postal matches and see what they have to say/use, cuz they actually burn powder every month.
Many of the replies you'll get here are from folks that ought to dust off that can of gunpowder they bought back in 1978 and go shoot something, or from guys that have it all figured out from reading and posting here....not burning powder.
What part of Montana are you in? You might be close enough to attend one of our Club hunting matches.
https://www.muzzleloadingforum.com/threads/bridger-mountain-men-shoot.151978/