Give it a whirl. It certainly won't damage your barrel. If you are good with scrubbing, then there's no reason you can't do it.
Agreed, a Hoppes tornado and a little elbow grease will knock it right out of there. It's just a matter of how much you enjoy using a cleaning rod 😂
Some rifled barrels shoot fosters fantastic. My old man had an old Hastings rifled barrel back in the day that wouldn't shoot most sabots worth a plug nickel, but it would stack rifled slugs. The thing would just about rip your dang head off taking a shot at a deer, though. It was short and ported behind the front sight ramp.