FWIW, I have a Model 83 in their 654 Silhouette, and that revolver is incredible. Granted, it has a 10-1/2" barrel, but the one in 14" twist allowed me to shoot the NEI 411-275 in competition. I don't remember the load data, but cast of linotype, I got a chronographed velocity of 1800 fps out of that revolver, with no signs whatsoever of over-pressure, and hitting turkeys or rams was no issue at all with their ISGW silhouette sight.
I also have a 7-1/2" Model 83 in 454, but to be truthful, haven't worked with it much. I CAN state, however, that a hard cast 325-grain SWC in front of 25 grains of WC 820 is a stout handful if you leave the micarta grips on it!
If you want one, get one... they are a phenomenal revolver!