My dad chucks bronze brushes in a cordless drill for his smooth-bores. It doesn't seem to hurt anything but it sure feels wrong.
Is it hurting anything?
the bore is not protected from pittling and corrosion because the oil cannot get to the steel because of the copper "plating"
A friend of mine is a metalergist, he says that two different metals like copper and barrel steel left unattended, will cause electrolisis and the steel will be the one that suffers causing pitting.
How did you do it?