Hi,
An iron wood dowel soaked in Fieberling"s ( spelling ) black or dark brown leather die will duplicate ebony at a lot cheaper cost and will not break either.
If you take a plastic plumbing tube , cap one end, partially fill the tube with die, put the ram rod in, fill the tube, leave it for a day, take it out polish it.
You will need plastic gloves, to handle and seal the rod, or your hands will look like you worked in a coal mine.
You can use straight grained hickory, but it is not as heavy as ebony or ironwood.
Good luck & keep your rod straight!
Fred