It is a well-known maxim that if you take cartridges of different bullet diameters based on the same design (for example the -06 line) that as you increase bullet diameter you get more velocity for the same weight bullet with equal pressure. For example the 120 grain bullet in the .25-06, 6.5-06, .270, .280, and .30-06. As you go up you will get more and more velocity. So too, you can use the 250 grain and run it in the 8mm-06, .338-06, and 35 Whelen.
Just to show how under-loaded the 9.3 x 62 and even the .35 Whelen are, I can easily get a 250 grain up to 2500 fps in my .338-06. So exceeding that speed in the .35 Whelen should be very easy and yet factory ammunition is often listed as only 2400 fps at that weight bullet. Some loading manuals, however show 2900 fps as achievable!
With the 9.3 x 62 they under-load even more since it is not only larger bore but has 10% greater case capacity. However some factory ammo is listed as only 2450 fps at that weight. But I guess that is why it is known for its mild recoil -- because it is so seriously under-loaded.
