Use a quality gun oil in your rifle, leave the bore butter for conical bullet lube. This idea of seasoning a modern muzzleloader is not necessary in my opinion. Clean the barrel back to metal every time your done shooting. Apply a quality gun oil like REM Oil with teflon of Birchwood Casey Sheath, Breakfree CLP, or some such. Before you shoot the next time take a patch and dampen it with isopropyl or denatured alcohol and swab the oil out of the barrel. Then a dry patch. Pop three 209 primers and load as normal. You will not have any problems.

Also when shooting sabots, never apply a lube to them. If they fit too tight, change sabots. I know there are people out there that grease their sabots. Fine, if that's what they want to do, who am I or anyone else to tell them not to. I just found the best accuracy comes with a moderate tight fitting sabot and moderate powder charge.

Thompson Center recommends the use of Bore Butter. Strange they market the stuff also. Just like CVA promotes the shooting of Powerbelts. I wonder what their take on those sales are?

That's a great rifle you got there. After you make sure and clean the devil out of it and apply anti seize to the breech plug threads, try shooting 100 grain of T-7 and a 200 or 250 grain shockwave out of it. See how that does for you. If it is a good accurate load that will be about all the juice you would need for most of your shooting.