W. Va. Code § 20-2-5l

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.