I am speaking with the good people at Dorleac about them Building me a switch barrel mauser on a FZH action. My thought is a 9.3x62 and a flatter shooting cartridge that is very common to simplify ammo in the great north and Africa. I don't think a 7x57 will feed perfectly so I was thinking a 270 Winchester or maybe a 30-06.

Am I missing an obvious better second cartridge?