When I started out building plains or mountain rifles, many builders used a brass or iron tip same length as nosecap. I think i have seen and read of some originals done this way, and looks good. Some have a threaded tip for jag inside, and a cup shaped larger tip at muzzle for loading - with or without threads. Have seen a few with 8x32 on one end and 10x32 on other - a modern accommodation.
Then migrated to tapered rod with different sized pipes, tapered iron tip inside like the old guns and near bore size flare at muzzle - especially for longrifles. I liked the plain wood look and flare in ramrod goes well with flare at muzzle.
But in researching the Bethlehem and C's Spring records, adding a brass sleeve at the muzzle end of ramrod was a common bit of work - on new and old guns. Sure it reinforced the ramrod in loading. The Oerter griffin rifle and another I've seen have such a brass sleeve as Louie mentioned, around a near bore size rod.
Bob