Thread: Which calibre for a Martini Henry project?

Looks like I might be able get my hands on a box of Martini Henry parts, in said box looks like two receivers with just enough parts between them to make a complete action, maybe missing a couple of screws/pins. If I get it I will need to get a gunsmith to make up some of the missing screws before fitting a barrel. Might be a good project but I'm wondering which calibre to go with, I'm guessing that a rimmed cartridge is best for this style of action, so I was thinking .45-70, .30-30 (or AI), 7.62x54R, 7x57R or .303 (or AI). I reckon if I can sort the action for next to nothing it could be a fun project, but I'm trying to be frugal at the moment. Any suggestions?