wattjb, S&W improved the 629 a couple of years ago because of the pounding the guns took in metalic silloute shooting. The Classic and DX versions of the 629 are examples of the improved models. I am sure their is a dash (-) after the 629 under the crane on the frame that indicates the improved version, but I cannot remember what it is, gettin' old. Anyway, if your revolver has the cylinder locking grove offset from the center of the chamber wall, it is the improved version and that is good. I have a Classic 5" 629 and it shoots the 300 WFN very well at a chrono'd 1150 fps and will penetrate over 3 ft. of wet newspaper. The pressure is less because of the cast bullet so I have adopted this for all my shooting with this gun. Probably put about 500-700 rounds a year thru the gun with the above load. The gun balances so well I will not not put a "glass" scope on it but will use a Holo-site or the new Trijicon.