It is interesting in that I thought the pressure the round generated precluded a Double.I suspect weight wise it is the same as their 470 NE which I find entirely too muzzle heavy.

For the same weight Double one would presumably be better off with a rimmed 500/416 if a high velocity 416 bullet was your goal.Correct me if wrong,but I do think the majority feeling of folks here is that more bullet diameter with standard Double velocities kills larger DG better that jacking the velocity up,i.e. you want a bigger hole in the animal.

Methinks that that a quality 450/400 would be lighter,penetrate well, and point better than a 416 Rigby Double or a 500/416.The only disadvantage it would have over a 500/416 would be less velocity for longer range non DG shots.The great SD of a 400 gr bullet with a scoped 450/400 along with needed elevation correction should compensate for that deficiency satisfactorily out to 250 yds.When paying trophy fees in Africa that is plenty far for me.