Don't be fooled by aluminum either. I've had a couple TC wood rods break, so I replaced it with an aluminum rod, thinking I was safe. Wrong!!!! Last year I was reloading, in a hunting situation, and the ball was stuck half way down the barrel. I was standing under the edge of an old wooden shed, so I put the ram rod up against the building and in the process of pushing the ball down the barrel, somehow the rod broke, sending me flying into a wood pile. Now I got a ram rod broken off, in the barrel, I'm trying to get up out of a wood pile, and a turkey flopping around. Fortunately I got the turkey, and didn't get hurt.
I realize, this is not the proper way to use a ram rod, but in the heat of battle, or hunting, this can and does happen.