Some time ago, Les Bauska had some #1 actions cast up for making up .600 Nitros. I wonder if anyone here has one or knows of one? Now, THAT would be a dangerous game single shot - as was F.Selous' 4 bore single smoothbore.
: About the #3 in .45/70. Back in the 70's a friend had one and asked me to load him up some 'heavy' loads. I used Hornady data, the heaviest, fastest loads listed for 500gr.Jacketed bullets - supposedly around 1,800fps. They sure kicked & it took him a long time to get people to shoot them off for him!