I spose everything except a single-shot flint lock will be considered a Saturday night special. Oh, they'll attempt to get them too. Muzzleloaders require that the shooter carry propellant in a seperate container (powderhorn, flask, etc.), thus, the shooter is in possession of "explosive material" used in bomb making.
Bye-bye flintlocks a la "anti-terrorism" legislation.
Jagd, they keep trying to introduce that dopey taggant into blackpowder so God knows what muzzle-loading shooters will wind up with in their smokepoles if the Feinsteins (rhymes with Frankensteins) and other leftists have their way.