Check Ctg's of the World - there are a number of possibilities in there and that's not all of them.
; J.J. Jennings book on Wildcat Conversions is also a good place to look, but that's putting the cart ahead of the horse.
: You need some Cerosafe (Brownells) to do a chamber cast to see exactly what you have. Make sure you follow the directions with it closely. It's dirt simple to do this and you end up with the proper dimensions to compare with the various books.
: If this is a gun for sale and you can't get the chamber cast done first, make sure you want it, then do the appropriate checking after.
: If it is indeed a .43 Masuer, brass and moulds are easy to get in the States. It is not for jacketed bullets. That ctg. puts out a 370gr. cast bullet out at about 1,360fps using black powder or equivalent loads of smokeless powder. You probably cannot buy ammo in any store for it.
; The bore must be slugged to see what the groove diameter is and bullets cast or sized to the appropriate size, .001" to .003" larger than the groove diameter. ome .43 Mausers will not allow using a larger bullet than .446" due to neck restrictions. This is unfortunate and then calls for using paper patched pure or almost pure lead bullets to shoot the best.