Id use a Beretta 92fs inox 9mm with a 20 round magazine

I'd use a Luger P08 it's fast it has no recoil and it fires and it's ready to fire right after first shot btw like revolvers IT NEVER JAMS UNLIKE TODAY'S GUNS

If I was to pick a revolver id pick a Smith and Wesson model 66 357 magnum

if revolver I'd go with these three
Korth Combat M1879 Reichsrevolver Mauser Zig-Zag. Mostly Korth Combat it fires 8mm bullets at 1370 feet per second (8mm is a big bullet)

I would use the one revolver from High school of The Dead, I don't remember what revolver it is though...