If we're talking a new model then a Manurhin MR-73. If we're talking an old model, S&W Model 29 (-2 or older), S&W Model 58, S&W Registered Magnum, S&W Triple Lock Target, Colt New Service Shooting Master .357 Magnum, Webley WG Army Model, S&W New Model No. 3 Frontier, Webley Bulldog .442 Webley, and Merwin & Hulbert Pocket Army 3rd Model