Mate,

A cape gun in .450 and 12-bore!

A set of 12-bore barrels!

7x57R barrels or 6.5x57R or 6.5x53R barrels.

I like them all better than .44 Mag.

But if that's your obsession why not. And then go for short barrels. You don't need long ones for that cartridge.

But why not a .44/40 or something older. Get it inscribed with 1890 or something to confuse people in the future.