Perhaps muzzleloaders need the chrome treatment to offset this abuse.
Perhaps more so at one time as we have learned some "hard" lessons about glass rods. These are pretty much a thing in the past but you still see many older cut and recrowned barrels. I still have many full length glass ramrods that I don't allow within ten feet of any of my SideLocks. One day at the range a fellow saw me using one of my bore guides on my range-rod and he commented that it looked like a pretty neat idea
Many a Big- [I]
or Investment Arms barrels, had chromed bores.
Be Safe !!!