No argument intended, but tell me why not? If you forget to take your ramrod out of the barrel someone will get hurt. If you double load a ML someone will more in likely will get hurt. If you don't know we're your shooting someone will get hurt. There are lots of scenarios that someone could get hurt. Telling me you can't put a removable vent liner cause someone might forget to put it in is not a good enough excuse for anyone who knows anything about Muzzleloader's and loading in general.