I have to admit that 30-40 Krag, AI or not, is looking good too. I can envision an American plains full length stock going into the rockies for an elk hunt... the choices just keep piling up.
The one question I still have is how can you enlarge the rim diameter larger using hand tools? Reaming a 30-30 by hand, if I am understanding, to a .303 Brit, 30-40 Krag/or AI, can be done by hand with a rented reamer. However, enlarging the rim diameter seems to be the gotcha for this project if you don't have a lathe. I have reamed only one rifle and that was a 357 mag to max.