Try one for the K frame S&W's. I've got the 9mm instead but from measuring the chamber centers and comparing them to my K frame S&W's they are the same within a thou or two. So assuming that they use the same diameter for the chambers the K frame versions should work.
If you have a set of calipers and can measure to the outsides and insides across opposite chambers I can confirm for you if it's the same as my K frame Smiths for sure.