I'll take a black powder rifle out from time to time during the general season, sort of "when the mood stikes me", although the beginning of the elk season belongs to my .338 Win Mag or .35 Whelen.
The down-side here (in Alberta) is that we don't have a dedicated "muzzle loader" season. If we did, I have no doubt that the flint and cap lock rifles would get more time out in the field. 8)