Do like I do and limit yourself to one muzzleloader!
I try to maintian a one muzzleloader inventory - one sidelock percussionrifle, one sidelock percussion shotgun, one sidelock percussion pistol, one break-open inline rifle, one inline break-open shotgun.......
even keep a ducksfoot in case highwaymen attempt to rob me.
Of course, there may be times when I have two of a particular style when purchases & trades overlap.