If it's a closed breach muzzle loader it's the same as any other black powder firearm. If you're only shooting for noise without a projectile then it's not considered a live round. Problem is the "great powers that be" generaly don't know the law.....as usual. And since 9-11 they have really stepped things up. I never have a problem where I'm at but they're used to me by now. You would be wise to give the local law enforcement a call and talk to someone in the know.....if you can find one. Good luck, it's a lotta fun.