Don R: Hiclkory ramrods are perfectly safe, as long as the grain of the wood does not " run out ". That means that to grain, runs along an axis different than the length of the rod, and some end grain is located on the side of the rod, rather than on the end of the shaft. Hickory grows very tall and straight, with often 4-6 feet between branches. This is the section of the trunk of the tree, when cut down, that makes good ramrod stock, and also good handles for axes, rakes, and other tools. You can also make pretty fair arrow shafts from such wood, however, it will be a very heavy arros to shoot. The reason that cedar is used for arrows, and certain west coast pines and spruces is because they also exhibit straight grain, consistent width between the growth rings, and lighter weight.
You can get lucky at Home depot, or Lowes, or Menards, or other hardward and home stores that sell dowel rods, if they carry a box of hickory rods. jUst inspect the rods yourself for straightness, and for straight grain that shows no run out.