I've got my 10-bore Westley Richards double rifle. I have to use it, and write about it for the Explora!

I've got my WJ Jeffery old faithful. Zabardast, "awesome", .450 No 2 Nitro Express.

My Cogswell & Harrison, is probably a .500 BPE of some sort.

Some Steyrs and Mannlicher-Schoensuers, 6.5x53R, 6.5x54, 8x56, 9.5x57.

Still need a:
Purdey;
a Holland & Holland, of course;
a Rigby.
Among others.

What do you have? And need?