Zonie mentioned "grain runout" earlier, and I wanted to expand on that a little more. I think straight, consistant grain, far outweighs any kind of treatment that can be done to improve the performance of ramrods. I would rather buy a crooked stick with good grain, than a straight one with runout. You can usually straighten a crooked ramrod with heat, so a little bend won't hurt anything.
Years ago when I first started hunting with a muzzleloader, I walked into a small herd of elk and found a legal raghorn standing broadside to me at about 15 yards. My brain went "AAAAAHHH!' and my heart went "BOOM BOOM!" I threw the rifle up and shot right over his back. The herd trotted off a short distance and I tried to get my shaking hands to reload. When I was trying to ram the ball home, I grabbed the ramrod up high and started jackhammering the ball and the rod split and went right into my hand. The wood entered my palm and travelled to the base of my thumb. I had to open up the split to pull it out of my hand, and I remember the pain went all the way up to my elbow. I had some electical tape in my bag, so I taped up the rod and got it reloaded, but by then the elk were gone.
As I was doing some first aid on myself back at camp, I studied the wood and realized the split was caused by faulty grain (I didn't even know the word runout existed then). I figured sooner or later, the rod was going to fail in that spot.
Now, I realize a good piece of straight grained hickory would not have stopped my buck fever, but it would have saved me from some pain and blood. So, check that grain folks. Bill