HUH?
Are you implying that Savage's and NULA's are outlawed in Mississippi ? I don't think so!
Smokeless may not be legal for hunting, but the rifle does not make a difference.
IMO, if I lived in Mississippi, I would absolutely buy a smokeless capable rifle.
1) In the future they may change the regulations forbidding smokeless;
2) You can target shoot with smokeless and work up loads without the need for cleaning your rifle, ( IMO, the #1 reason that most folks don't shoot their muzzleloaders much );
3) If you go hunting to different States, some will probably allow smokeless.
Now there are some States that don't allow 209 primers or closed ignition, or mandate side or flint locked weapons, but most Knights and T/C's are not legal there either.
I still know of NO PLACE where the Savage or NULA is not allowed, where a similarly designed Knight would be allowed!
edge.