Mickey

I agree with your thought "like so many of the new ones being flocked to shooters nowadays that offer marginal improvement at the cost of buying a new rifle.. "

It seemed to come out at the time 416 in anything was all the rage. Although only a small part of it, I must admit for reloading both a bolt and a DR, having them both in 416 may help in some countries (some people seem to try to squeeze every little bit of saving out of everything !!!)

But as you say and as I have seen in the field, a little bit of extra this or that either way makes eff all difference to the animal if the bullet is put in the right place. A bit like 300 H&H versus 300 Win Mag argument !!!