It may seem an unusual idea but because of game laws and regulations in my area we are able to carry a muzzle loader of any caliber almost all year but cartridge guns are restricted to smaller than 23 caliber.
So---- I have several parts rifles in 43 Mauser . I was thinking of putting in a breech plug to accommodate a 209 shotgun primer and altering the muzzle to become a bullet starter and away we go.
I have no problem doing this with a standard 55 or 60 degree v- thread but it seems that all the removable breech-plugs are using a square or buttress style thread. I cannot see it being a safety issue as you still have the original bolt retaining the breechblock as if it were a cartridge.
Any thoughts on this from a tinkerer or gunsmith who may have done similar?