From my personal experience and perspective in owning one 9.3 X 62 over the past six years, perhaps there are a few things I could, or should, add to this discussion.
First off, though, I'd like to say that anything stated by myself is with all due respect to those who have commented, and especially JB who has far more experience with the 9.3 X 62 that I do, or perhaps will ever have.
I'm not a professional in this business, and have had to make a living in another profession, so time and economics have not permitted that I engage in as many hunts in as many places as perhaps I should have liked to. However, wile being limited to eastern Canadian hunts in several provinces, that still covers a huge area (Ontario alone is contiguous to four of the Great Lakes and six of the United States of America, as well as bordering part of the Hudson Bay coastline. We also have an abundance of bird species, small game, medium game and large game, plus several predators)of which only a very small part has been hunted, or even visited, by myself.
I've been a hunter since about the age of fifteen and am now more than two months into my eighty-second year. I started reloading thirty-six years ago. Since then, I've handloaded every centerfire rifle I've owned. In fact, I've only purchased one box of factory ammo over that period, and that was due to owning my first .35 Whelen and wanting some brass for handloads.(The Remington fodder were the 250gr RNs that chrono'ed 2247 fps, average, while advertised at 2400 fps. That's one reason why I don't purchase factory ammo. I was able to get 2600+ fps from some of my 250gr handloads.)
Handloads, over the past 36 years, were made for -- starting from smallest to largest -- .22 Hornet, .223 Remington, .25-06 Rem., 6.5 x 55, .270 Win, 7-08, 7mm Rem Mag, 7mm Wby Mag, .308 Win (for a friend), .30-06, .308 Norma Mag, .300 Win Mag, .300 Wby Mag, .338 Win Mag, .340 Wby Mag, .35 Whelen, .356 Winchester (owned by my son), .375 H&H, .44 Rem Mag, .444 Marlin (for another son and also a friend), .45-70 (multiple, including several in a Ruger #1) and .458 Win Mag. There were often several in several of the afore mentioned cartridges. For example, six .300 Win Mags.
Now, that's not much compared to many on these forums, but I've never been a casual owner of rifles for the sake of saying "I own such-and-such a rifle..." Never a collector. I've owned rifles for one purpose only -- hunting! Therefore, all handloads have not been to produce tiny-little "bugholes" as bragging rights, but the most accurate loads I could safely produce from good to excellent hunting bullets at top velocities. Most of them would shoot MOA or better.
That brings me to comment on loads for my 9.3 X 62. I use one powder and two bullets for hunting. Make no mistake, I've tried several powders and six bullets. The bullets are in order of testing and use: (1) 286 Hornady at up to 2460 fps -- shot one bear at around 2400 MV using RL-15. (2) 270 Speer -- tried several powders and MVs. My rifle simply doesn't like that bullet. (3) 286 Nosler Partition at 2622 fps -- Powder RL-17. Shot a trophy quality bear. One shot and done. Bullet penetrated 30-inches and retained 211 grains. (4) 250gr Nosler AccuBond at 2715 fps using RL-17. Shot another bear with the same or similar results. Bullet made exit and made massive blood loss. (5) 232 Oryx -- RL-15 produces a good reduced and very accurate load at 2450 fps. Shoots five into sub-moa. Good load for woods hunting of medium game. (6) 320 Woodleigh. RL-17 produces well over 2400 fps but testing still in process. Have also tried H414 with reduced MV and better accuracy.
In summary: The two hunting bullets for myself are (or would be) First: The 286 NP and secondly: the 250 AB. Either will reach out to 500 yards with enough energy and velocity to handle a mature bull moose (2000 ft-lbs+). The best all-around powder has proven to be RL-17. It gives 170 fps over-and-above what I could safely obtain from RL-15, with apparently less pressure. QL also says it's safe based on the standards I set for my rifle which is a modern bolt-action with a 22.5" barrel. There is no more evidence of excess pressure than I've ever witnessed in all the magnums I've ever handloaded -- the non-magnums also included. It is THE best medium-bore rifle I've ever owned when measured by several factors that are meaningful to me as a handloading-hunter.
Bob
www.bigbores.ca