Ray:
You are missing the point, quite deliberately I'm sure!

Holland & Holland were not seeking ballistic innovation, and in no way attempted to 'improve' the already proven! They brought out these proprietary cartridges simply to offer their exclusive clientele something 'special'.

Let the proletariat squabble over ballistics and pressure-spikes in 'ordinary' cartridges like the .416 Remington, a Holland & Holland patron jolly-well deserves a Holland & Holland chambering!

In any case Ray you give yourself away: no cartridge is "deader than last year's moose" more than the .404 Jeffery, yet we love it dearly. ...not for the ballistics, which are duplicated or exceeded by a number of modern cartridges, but because it is jolly-well the .404 Jeffery!

Why deny a Holland client this same sentiment!?!