I have a BP .50 cal i use bore butter on the rifling after every shooting and cleaning to help maintain the quality of my bore. Is bore butter safe for my cartridge fire rifles. I know im a noob. Feel free to critisize.
No reason to criticize, but no reason to use Bore Butter unless you just like the smell. Intended to counter the corrosive nature of black powder. Won't hurt anything, clean before shooting, your mileage may vary, sic transit gloria mundi.