Most rifles are built for distance. Double rifles were built for the opposite problem, what happens when the animal is close, the first shot didn't finish it, and you need the second one now.
The design goes back to the great African and Indian hunts of the nineteenth century, when professional hunters and sportsmen faced dangerous game at ranges measured in yards rather than hundreds of yards.
A bolt gun requires you to work the action. A double rifle gives you two independent barrels, two independent locks, and a second shot available as fast as you can move your finger. In that moment, mechanical redundancy isn't a luxury. It's the entire point.
Building one well is among the hardest things a gunmaker does. Two barrels must be regulated to shoot to the same point of aim and a process done by hand, live-fire, adjusting until both barrels agree. It cannot be automated, and it cannot be rushed.
A double rifle is easy to admire on a rack. What it's actually built for is the moment when everything has gone the way it goes.
John Mogle carried a Rhino Express in Bushmanland, Namibia on a licensed elephant hunt. See how the Rhino Express performed:
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