What a lot of folks do wrong when it comes to muzzle loaders is they try to make it care free!
Muzzleloader shooters are quick to adapt and realise there are simple ways to achieve what they are looking for.
As others say, forget the store!
Get some olive oil and add it to some melted candle wax or bees wax or beef fat, don't use salted lard. When that is set you have your thread protection and bore protection and bullet/patch lube in one old re-used tin!
Your a smart man, come up with a way to get some water in that barrel and work with a jag, repeat a few times.
Now get a kettle full of boiling water through that barrel, USE A THICK TOWEL TO HOLD THE BARREL. Whilst red hot run a dry patch to soak heavy droplets. The heat will dry the barrel for you now. When cooled some get that lube you made down that bore and all over it, will melt and flow everywhere.
To shoot the gun put a patch and jag on a rod down the bore and shoot a cap, all lube will spray onto the patch and not foul the powder come the first shot.
This is how I do my muzzle loaders, all three of them, no rust and nothing store bought and thats using Pyrodex, the most corrosive fuel known to man!
It is not a black magic thing. A simple solution is all that is required. WATER. Oil is bad with muzzleloaders unless vegtable or animal based!
Glad you using a M/L
N.
Psalm ch8.
Because I wish I could!