Re: 9.3-74 et 9.3-62??
I know of the 9.3X57, 9.3X62, 9.3X64, 9.3X66 (Sako) and 9.3X74R.
The R was rimmed and for use in doubles and drillings. The caliber is still popular in Europe and there are quite a few still in use here in South Africa.
As I understand the ballistics are similar to the 9.3X62 (although data would not be interchangeable).