I think you'll find that Teddy used a 500/450 H8H double rifle given to him by a group of rich business men for his 1905 hunt in Africa. His other rifles were the model 1895 winchester chambered for 405 Winchester, and a springfield 30-06 bolt rifle. Kermit used a 450NE 3 1/4" double, and a springfield 30-06.
The Buffalo, elephant, rhino were all taken with the 500/450 H&H double, the 405 took a couple lions, and a leopard, and this was the rifle he called his lion medicine,untill he shot a couple of lions with it. He wounded more game than he took with the 405, and the 30-06. Still in the 9 months he and Kermit hunted they took a very large bag, of animals.
The 450/400NE doubles were the favorite of John (PONDORO) Taylor not TR, and he didn't wound very mush of what he shot at.
When Hornady came out with the 405 Win ammo a couple years ago, they made one big mistake! They pictured Teddy on the box standing over a large rhino, with the 1895 Win. This was a sceen that never happened, and gave customers the idea that the 405 Win is an African dangerous game cartridge, which it most certainly is not. It is fine for the cats, or Bears but is certainly not Buffalo rihno, or elephant medicine. The 450.400NE 3" is minimum in the running for things like Elephant and then only in very experienced hands. But is about perfect for buffalo hunting.
The Clark double rifles are converted shotguns, and not particualrly well done IMO. The only chamberings I would even consider is the 45-70, and the 405 Win. IOM $5K is about $3K too much for this double. :2c:
Sorry but that is not a very well done conversion, and certainly not well suited to anything larger than the 45-70, or 405 IMO. However if it floats your canoe, the cough up the bucks and set sail, you can have the one they were going to sell to me! :thumbdown: