In power, the 9.3x62 is ahead of the .338/06 as well as being ahead of the .338/06IMP.
: Case capacity of fired Sako 6.3X62 brass is 78gr.
: Mine did 2,518fps with 286gr. Norma's and 2,610fps with 270gr. Speers. There are now "X" bullets of proper weights for the 9.3, so there is no benefit for the 338 bore size. The 9.3x62 easily makes over 4,000ft. lbs., if that is a number you like.
: The .338's higher Sectional Densities are of little real use as the premium bullets today have replaced Sectional Density benefits with better construction, giving equal or increasd penetration with lighter bullets which also have flatter trajectories.
: That said, most big game here in B.C. is shot at 100yd. or less.
: Either is good but the 9.3 is better.