I'd appreciate that 303British, I'm a little way of starting but will be in the market for a No 4 action shortly. I'd considered the 45.90 as I've heard the 45.90 feeds more reliably than the 45.70 due to it's overall length more closely matching the .303 Brit cartridge.

Daryl's tip re the necked up .348 case is more than worthy of consideration also. I do have several hundred 45.70 cases and several hundred Cast Projectiles on hand and nothing to shoot them from just to complicate choices though

regards Jacko