Doc, OK exactly what I thought. Max loads in the Blackhawk (have an old 3 screw .45) and warm in the 625 MG. What I didn't get was the 625 and 629 being built on the same frame yet the 625 not able to take warm loads (according to many internet experts). And no I do not have a need to run any load hot to those that might say buy a Redhawk.

Per John L.:


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Reports from the prestigious H.P White laboratory prove to us that most American Made revolvers offer approximately 100% safety factor with current Industry standard pressure level ammunition. Example: The .44 magnum is loaded to 40,000 CUP (Copper Units of Pressure). H.P White's lab reports states that the Ruger Super Blackhawk was destroyed in a controlled test at approximately double that pressure. (80,000 CUP) The Smith and Wesson Model 29, also in .44 magnum caliber showed comparable results. Today we have stronger guns chambered for the .44 magnum (Redhawk prime example) but the Model 29 S&W and the Ruger Blackhawk gave life to the .44 magnum cartridge. The strength and design of these guns satisfied the industry at the time (1955) and the standards were set from these firearms.



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Case head thrust is CHAMBER PRESSURE x THE SURFACE AREA OF THE DIAMETER OF THE REAR OF THE CHAMBER. I won't go into great detail but a 45 Colt at 32,000 CUP chamber pressure exerts just under 3 tons of pressure on the back of the frame. A .44 magnum at 40,000 CUP chamber pressure exerts just over 3 tons of pressure on the back of the frame. Basically the same.

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