When I made my personal Hawken rifle a couple years ago, I made a replacement rod for it out of Osage Orange. The main rod was of hickory. Both are 1/2" tapered to 3/8" so neither is in much danger of being broken, but when I made them, I stained them both at the same time, and now, I can't tell which is which. If anything, the osage rod is stronger and more flexible.
I have used hardware store doweling made from Ramin, in big diameters, when hickory was unavailable, and it works fine if not subjected to abuse. It tends to break straight across when it goes.