Use of certain rifles to hunt in muzzleloader season

Notwithstanding any other provision of this code or any rule promulgated thereunder to the contrary, any person lawfully entitled to hunt may hunt with a singleshot muzzleloading pistol or singleshot muzzleloading rifle, having a bore diameter of not less than thirty-eight one-hundredths of an inch, using an encapsulated propellant charge that loads from the breech, with the projectile loaded from the muzzle, during any established muzzleloader season: Provided, That such muzzleloading pistol or muzzleloading rifle may not be used for hunting during the Mountaineer Heritage season.