Typical ramrod tips for the end that is in the ramrod hole were long, tapered iron tips that were made of sheet iron and having a brazed seam. This was threaded for a worm and possibly a ball puller. I don’t know if examples of jags from the 1700s. The business end of the ramrod, at the muzzle, often swelled quite a bit if there was no metal reinforcement. Bob Leinemann’s new book on Moravian rifles shows an early rifle with a stout diameter at the muzzle, reinforced by a brass cylinder open at the end.
What we commonly see as ramrod tips today (parallel-sided, non-tapered ramrod tips threaded 8-32 and fitted with turned jags) appear to be percussion era developments.