Here:
There. That's not going anywhere.
British Army WWI vintage .455 Webley top-break revolver. I even have the holster. It's a great old pistol, a little hard to find ammo but I have found a source for brass that's turned down from .45 Long Colt (the .455 round is not only shorter than .45 LC, it has a much thinner rim.) You can still get the big old lead pills for it, but I have a Lee bullet caster just in case.