For many years Ft. Sill, OK had a two week muzzleloader deer season. Any muzzleloader could be used so long as the caliber was .40 or larger.
Last year Ft. Sill went to a split season. First week was conventional muzzleloaders only, no scopes allowed: Patched round ball or conicals only.
Bought a nice TC New Englander for that first week's hunting and sighted it in for the TC 370 grain Maxi-Ball. Decided to limit my shots to 75 yards. Saw numerous deer but did not get a shot. Could have easily killed several different deer with a scoped inline.
Hunted all week, saw a lot of deer and got some good exercise. Had a blast.