I have built up more than a few 9.3x62s and 9.3x64s. I much prefer the 9.3x62 over the 9.3x64. The 64s gave me about 75 FPS over the 62s and brass is expensive and hard to find and could be impossible to get any time in the future...
I have shot Cape Buffalo with the 9.3x62 and the 320 gr. Woodleighs at 2400 FPS or a bit more in a 26 inch barrel. It is on par with the great .375 H&H..the 9.3x62 really cooks in a long tube btw...
I would just rebarrel your rifle, reboring is iffy and expensive and takes forever to get one back, its best for those collectable guns that you don't want to change the outside on.
