Hmm.....big, stainless, big, and single action....and big.
Lemme see............
Have no idea, compadre. Lots of big revolvers out there. The biggest I've seen was the .500 S&W, but it was double action. The super redhawk is a fair piece of artillary too, but it's also double action.
Maybe you should go back of give them a call and see?
Good luck,
~Rat