NO one I know. You can call the suppliers, ( see LINKS) at the top of the index page to this forum, under Member Resources). Tapering ramrods is done by the buyer, because the supplier can't possibly know how much or how little taper you need. The same size Hickory Ramrod can be used in a number of different caliber guns.
Ramrods are tapered on power sanders, disc, or belt, or by hand with spokeshaves and draw knives, files, or pocket knives. Final finishing has been done with all manner or scrapers.