If choosing between the 9,3x57 or the 9,3x62, I would reccomend choosing the 62mm case. The 57 case is kind of "unneccesary" as it still needs a long action to work (just like the 6,5x55 - nice cartridge but oh so wrong in OAL... ever seen the 6,5 rattle around inside a modern action made for .30-06 lenght cartridges? A sad sight, I tell ya) Also there is no great chance you will find a smith having a 9,3x57 reamer on stock.
The 9,3x62 is a real nice round and will handle most needs a hunter will ever encouter exept really large game like buffalo. It might not be a stopper but it will kill most game without any problem. IMHO.
Per