You'll spend almost as much on doo-dads for your range kit/possibles bag...
Just a few items: cleaning supplies... BP Solvent, oil, bore butter patches, pipe cleaners, mild detegent, rags, nipple picks, jags, a little funky LED light that can be dropped down the bore... a 20 ga shotgun 'fuzzy full length clening rod' for the .54, one more in 12 ga for the .12 ga... bore snakes in .44 and .36 cal...
And the 'neat' itmes... fancy powder flasks/horns, patch boxes, patch knife, holster, slings (a must have for a hunter) , presentation box, fancy possibles bag...
and the practical 'in the field' items: speedloaders (they are NOT all made the same, I've folded three in half) the bullet puller, flask of powder, powder measure, Shot snake, mini cleaning kit, nipple bands (rubber ring that fits over the nipple for a waterproof seal), caps, knife, bullets, spare nipples, wedge puller, plus all the OTHER stuff normally in my 'go bag'... like TP, gorp, a camera, space blanket, matches, a poncho (very useful in BP season), paracord, deer drag, whistle, spare skinning blade, surgical gloves I always forget to put on, sierra cup, water purification straw, camelback etc etc etc.
Plus the whole bullets/powder/shot thing.
There is a reason muzzle loaders don't bring a lot of guns to the range... they are hauling a tacklebox full of crap.