As stated, you can't use a firearm tag during the muzzleloader only season. You can use a muzzleloader during the firearm seasons with a firearm tag and you can hunt the second firearm season with a muzzleloader tag as long as the counties are the same. For instance, if you use both your firearm tags during the first firearm season and have muzzleloader tags for the same county, you can use them the second season. If your ML tags are for a different county, you could hunt the second firearm season there.