Any hickory will do but the best way to get good hickory ramrods is thru Steve Bailey who advertises in Muzzle Blasts. But for fun, take a thigh-thick hickory with a limb-free zone 6 feet or more in length, cut it down, shave off the bark, and split and rive it to pieces free of knots and 5' long and 1" or more at the thick end and half an inch or more at the thin end, tie a string around one end of each and suspend from the rafters somewhere till dry in about 6 months. Then they can be made round. Shagbark and pignut hickories are very good for bows and will therefore work great for ramrods.