Ben- you into Battlefield or COD?
Reason I ask- THAT gun never went into full production. So no, you are not real likely to fin it in the US. And only players in those games ever heard of it!
The fatal flaw of break action revolvers- the action has this HUGE chunk chopped out of it, and is never as strong as a solid frame gun. There were TONS of the top breaks made up to the 1930s, but normally not found in higher powered calibers- .38 S&W is usually the upper limit of power. If you dig around, you can also find British Enfield revolvers- .455 is about the upper limit.