I use the 9.3x74R case to bring the .45 bullet up close to the rifling in the .45/410 barrel. It works very well, with excellent accuracy.
I've also used the .444 case, but it is shorter, and the rims sometime slip under the ejector after firing. I use the brass .410 cases for shot.
This is one of the most versatile weapons ever designed, and I doubt it can be surpassed in a survival-type scenario.