Speaking of muzzleloader nipples, every British ML I have ever measured had 1/4" 28TPI threads. Nipples for Muzzle loaders come over size in many different thread diameters such as .255" x 28 or .260" x 28. You might check but if your nipples are 1/4"x28 then starting with an over sized ML nipple might be just the ticket.


Firearms imports, consignments


[Linked Image from i.imgur.com]