I could shoot muskrats with my musket if I felt they were a threat to my person. I would yell “it’s coming straight for me!” before shooting to make sure I was following the law.
I’ve owned replica black powder long guns and pistols- both cap and ball and flint lock.
I shoot them at the range. I have one hanging over my fireplace- a Sharps.
If you fire them they are a chore to clean. You have to boil them to remove the powder residue otherwise it will erode the metal.
I own an old musket that is unserviceable and a contemporary muzzleloader. Been a few years since I have hunted during the muzzleloading season, as it is a pain to clean those things.
I actually do have a musket. It was passed down from an ancestor who fought in the Revolutionary War. My gunsmith has it right now. There are 2 or 3 museums who want to buy it, but I’ve told them that I don’t want to give up ownership. I am negotiating with them to see if they might want to lease it. That would kind of be a win - win situation.