You are right, the firearm season. But you can't use the rifle or pistol during muzzleloader season .. and they are similar, right?
You can use a muzzloader in our regular gun season or our shotgun season but in all actuality when they came up with the seperate seasons for muzzloaders there was a tremendous difference in their range and performance to that of modern firearms and that's why the distinction was made. Now that muzzloading as we know it has transofrmed to what it has there is no longer the need for the two seperate seasons. The transofrmation of muzzloaders kind of reminds you of the transformation of the compound over the years doesn't it