Coll,
I have the 9.3x64mm & my loads of AR2209 exceed 2600fps somewhat with the 286 Woodies & these are top/max loads in my rifle. My barrel is a full 26" so it will get a bit more steam up as well.
I know every rifle is different, yours might be a freak to do so but it seems WAY too high for a 9.3x62mm to achieve these velocities?
One of the guys here might have access to "Load for a disk" or "Quick load" & check for you if you supply the load.
If you go down this path please start low (drop 10%)& follow normal loading checks, stiff bolt etc; just remember not all primers flatten out when the loads get right up there, beside no one wants to see someone get blown up!
Bob Mitchell does tend to be a bit of a "rev head" - please note that I'm not saying that his loads are not genuine (only safe in his rifle only), but his loads trend towards the very high end in my books.
Take care
93x64mm