I don't have experience recovering 9.3x62 bullets from grizzly and elk. I do have some experience with the 9.3x62.
Any factory ammo launching the traditional 286gr bullet at 2,200 fps or faster will kill grizzly and elk just fine if you do your part, so choose the one you shoot best. Prvi Partizan's 285gr load is at the low end with soft point bullets at 2,263 fps. Remington's 286gr Corelokt load is 100 fps faster at 2,360 fps. Federal Premium Safari loaded with a Swift A-Frame is also at 2,360 fps. The extra 100fps gains you an extra 300 ft/lbs at the muzzle.
I would avoid the solids. If you are hunting big Alaskan Grizzly or Brown bear I'd spring for the Federal Premium Safari with A-Frame, not because the velocities produced by the 9.3x62 demand it, just that it gives an extra dose of confidence if you hit bone. If just hunting elk in grizzly country I'd go with the Remington load, unless you expect long shots then Hornady's superformance spire point load might be a better choice.
Good hunting,
Jimro