Greetings Lochinvar,
Khomas Highland Hunting Safaris of Namibia, welcomes you to the greatest forum on earth.
Like the others here, I too look forward to details and photo/s of your pending double rifle.
The one in my avatar was marked “Army & Navy Cooperative Society, London” etc.
It was in caliber .450 No2 NE.
It had 28” barrels and external, rebounding hammers but, was built as a nitro / smokeless rifle from the beginning.
It regulated extremely accurate with 480 grain softs and solids @ 2050 fps, through a chronograph.
Although pretty much the ballistic twin of a typical .458 Winchester load from the 1950’s / 1960’s, it generated only about half the chamber pressure of the .458 cartridge.
Therefore, it had very mild recoil, especially considering how powerful it was.
I worked up the loads for it, sometimes firing while seated at a shooting bench, over sand bags.
During one session, I fired 60 rounds from it, (mostly standing over sticks that day).
There’s no way I could’ve fired 60 rounds from a typical bolt action .458 Winchester caliber rifle, due to my sissy shoulders.
Anyway, when you get a spare moment, have a look into the Khomas Safaris web site.
Best Regards,
Velo Dog.