When proper usage guidelines are followed such as stated by Stumpkiller, there is little danger.
In 35 years of jamming balls down bores I've had no problem with breaking rods. I've never owned a hickory ramrod! I've always thrown the rods away that came with the gun and made my own out of hardware store dowels. Originally birch, but those are no longer available in my area. Also used generic "hardwood" rods from the big box stores. Even though they are a poor quality, none of them have ever broken. Nowadays, any wood rods I make are oak dowels from the big box. They all have some degree of run out but they hold up just fine.
Two of my guns are outfitted with metal rods. One steel and one brass. Not for fear of using wood though.
So, all in all, I'm thinking that regardless of the inferiority of red oak, a split from a straight grained piece of wood will probably make a decent rod. Guess I better get to work on it! :haha: