If the grain follows the curves of the sticks, don't give up hope just yet. Hickory doesn't steam bend well compared to many other woods IMHO, but it will bend with dry heat. You'll have to get it quite hot, but not flaming hot! Wood gets plastic when sufficiently hot. The question isn't whether it will bend - it will. The question is whether it splits when you bend it. That you'll have to find out. A heat gun is probably better than most other choices as it will get it hotter than the usual steaming, but won't have too much of a tendency to char the wood.
Note if fungus has gotten into the wood, it will be rather weak compared to what it should be. Then it would not be suitable.
Yes, it is amazing how bad the available ramrod blanks are. I've been an archer, fletcher, bowyer. I think about the hickory I've made self-wood bows from, and the comparative lack of quality of the ramrod blanks I've seen. Sad, just sad...
Gerald