Hello Alex,

you stated a nice caliber it in your first mail: 400/350 Rigby Nitro Express

advantages:
- rimmed cartridge and low pressure for easy extraction
- bullets for game available in an adequate selection for near all applications
- use of handgun bullets possible for target practice and varminting :-)
- cases are available from bertram or can be made with a little (more?) effort from 9,3x74R
- gentle recoil
- more than 100 years old (if I remind correctly)

I have an old Rigby Mauser in this caliber and I consider the cartridge as a good one!

best regards
Rolf