Michigan doesn't regulate which muzzleloader you can use, just the powder you load it with. No mention of ballistics in the regs. The Savage ML and the Remington Ultimate are legal as long as they're loaded with BP or a sub. During firearms deer season in the two northern zones, muzzleloaders are allowed with no mention of powder type.
As far as I know, Michigan doesn't have a "stupidity law" to regulate people loading smokeless in BP/sub only guns....or ice fishing on a detached slab of ice with an offshore wind.
From the 2014 Michigan Hunting and Trapping Digest
During the December Muzzleloading Seasons.
"Muzzleloading deer hunters can carry afield and use only a .. muzzleloading rifle, a muzzleloading shotgun, or a black powder handgun loaded with black powder or a commercially manufactured black powder substitute."
Firearm Deer Seasons - Limited Firearm Deer Zone.(old shotgun zone)
"• A muzzleloading rifle or black powder handgun must be loaded with black powder or a commercially manufactured black powder substitute.
• A .35 caliber or larger rifle loaded with straight-walled cartridges with a minimum case length of 1.16 inches and a maximum case length of 1.80 inches.
• A .35 caliber or larger air rifle or pistol charged only from an external high-compression power source, or a muzzle-loading rifle."
Firearm Deer Seasons - North of Limited Firearm Deer Zone
"Deer may be taken with handguns, rifles, crossbows, bows and arrows, shotguns,and muzzleloading firearms, including black powder handguns."
