Years ago, people never even got concerned about the rifle's accuracy until they had shot at least 100 rounds through it. Then they started to try and tune a load.

We used to scrub the bores with comet cleanser, valve grinding compound, some fire lapped them, now we J-B Bore paste them with a scotch brite and some paste. All of this is for one reason, to smooth out any ruff spots in the bore. If your rifle is shooting as good as you say, you have no ruff spots and no need to worry about break in.

Seasoning as said, is the process of treating the bore. Remember the cast iron fry pans your Grandmother had? If you wanted to make her scream, you washed it in dish soap, and let her catch you doing it. She might have boiled a little water in it, but other then that, she wiped them out and called them clean. That was seasoning. Seasoning with borebutterjust works in to the pores of the metal a wax/natural lube substance. The build up is supposed to keep them rust free, and make loading easier. In your case, I would not season the rifle. It could effect that excellent accuracy you have going. I just clean my muzzleloaders like a modern rifle, then oil down the bore.