I once bought a T/C Hawken from a friend that used bore butter. When I removed the bore butter the bore was rusted under it, rusted bad. I ended up trashing the barrel and selling the rest of the gun. Do not trust bore butter to protect against rust. I only have stainless barrel inlines and keep them clean and oiled after shooting. I have a blued barrel Hawken that I clean after shooting and put a light coat of oil on the bore. As the man said, forget bore butter.