We developed the 30-06 from the 7mm mauser(7x57) round we just copied it and made it larger.
I find the 9,3mm line up of rounds very interesting. We have the 9,3x53, 9,3x57, 9,3x62, 9,3x64, 9,3x68 and so on. I'm sure they are not putting a 286gr bullet in the 9,3x53 or 9,3x57?
As far as recoil I have put a 1" thick recoil pad on my 30-06 so my son could shoot it and it made a world of difference in shooting it too. If the recoil is too much you can port the muzzle too besides a larger recoil pad.
Saiga is offering a semi-auto in 9,3x53 it should be here soon and one in 9,3x64(tigr) but its not imported here yet. I wonder how the 9,3x53 performs?