unfortunately i have some rust issues with my .50 cal flintlock. it was rode hard and put away wet i suppose. (please refrain from being my dad and lecturing me...i know, i know) not looking for a new gun or barrel or harsh words...i just need a sturdy bore brush for now. i wanted to use a stainless steel brush but cannot find one in .50 caliber. does anyone have a source for this? how much harder is bronze than brass? i can find bronze brushes.