$350 is about half of what you need to buy a quality muzzle loader.
But then most buy a cheap third world production piece, have nothing but problems, and give up, because the junk dont work right.
Ever try to get replacement parts for these cheap guns? It takes years sometimes, or you just get the part made at high cost.
Those that dont give up, end up buying a semi-custom, or custom built, or do what we did and made our own.
Its not rocket science, folks with 6th grade education used to build master pieces.
BTW OIL, petroleum products WILL NOT WORK WITH BLACK POWDER
It mixes together to make sludge. Which gums up the entire system.
As far as loading goes, 80-90 grs is too much for most calibers under 54.
They have a cool thing called the Davenport Formula. You can find how much powder is the MAX your barrel can burn,
then work backwards to get the most accurate charge.
My standard load is 54.5 grs of 3f. That yields 1630fps. When I double the charge for longer shots, I get 2033fps.
Using the Davenport Formula, I reduced my charge to 74.5 grs, and I still get 2033fps.
Stop wasting powder.
You can do a search for the Davenport Formula on the website, Ive posted it before, or PM me and & send it to your.