When using the wooden rod I use looser load combinations.
Another option is fiberglass. Cover it with shrink tubing that has the hot melt glue inside. Maybe 9mm fiberglass with shrink tube, there are places that sell fiberglass and carbon fiber rods that look promising.
A naked fiberglass rod is abrasive and may injure your hand when worn. I was able to wear a coned muzzle into a TC with a fiberglass rod in a dusty environment. I shot that rifle a lot when I was a kid.
I now use steel rods I make. I make a muzzle guide out of brass. I prefer polished hardened steel. 1/4" is plenty strong. It is spring temper. You can not bend it. You can get that at music wire. It needs to be cut with carbide to add an outsert that is drilled and tapped for the accessories. Golf balls make excellent knobs.
https://ksmetals.com/collections/36-long-music-wire
I have heard it argued that aluminum and brass can pick up grit thus acting like a lap.