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High pressure loads in other brands or models of guns
But what about other modern revolvers chambered for the .45 Colt cartridge? For many years Smith & Wesson built a .45 Colt DA revolver on their large "N" frame that looked nearly identical to their .44 Magnum Model 29. I have been asked specifically about this revolver in the past, as their owners sometimes conclude that if the Model 29 can withstand the 36,000 psi (43,500 cup) of a .44 Magnum cartridge, their revolvers should be able to withstand the same pressure. BUT THEY CANNOT!
The reason is that the Model 29 is made from special alloy steel specially heat treated to withstand .44 Magnum pressures. S&W themselves have put this in writing in their advertisements, and a talk with one of their technicians will confirm it. NEVER use any high pressure .45 Colt load in a S&W revolver. They are designed to handle standard pressure .45 Colt loads ONLY.
The original model Ruger Vaquero is a fixed sight variation of the Blackhawk and falls under the "Blackhawk" classification, as is the Ruger Bisley version of the Blackhawk. These are cosmetic variations capable of handling the same pressure as the standard Blackhawk, and fall under the general heading of "Ruger Blackhawk revolvers." The "New Model" Vaquero, introduced at the end of 2004 primarily for cowboy action shooters (who use only low pressure loads), is built on a smaller frame--much like a Colt SAA--and is not recommended for high pressure loads.
The authors of the major reloading manuals were aware that there are modern guns other than the Blackhawk and Contender that are chambered for the .45 Colt cartridge. These include not only the Colt Single Action Army, Colt Cowboy, and the various replicas thereof, but the DA Colt Anaconda, Ruger Redhawk, aforementioned "N" frame S&W, and others. But no exception is made for any of these guns, not even the excellent Anaconda and Redhawk. Clearly, FOR BLACKHAWK AND CONTENDER ONLY means just that!
The following quote is from the section of the Speer Reloading Manual No. 13 devoted to high pressure .45 Colt loads, and reinforces this point.
"IMPORTANT SAFETY NOTICE. These loads are intended for use only in Ruger Blackhawk and Vaquero revolvers, and the Thompson/Center Contender. They are not to be used in any other make or model of firearm!"
The Hornady Handbook, 3rd Edition prefaces their high pressure data with this simple statement: "The following data is to be used only in the T/C or the Ruger Blackhawk."
My copy of the Sierra Handgun Reloading Manual makes this blunt statement in the first paragraph of their section devoted to high pressure .45 Colt loads.
"The data on the following pages were developed for use in the Ruger Blackhawk and the Thompson/Center Contender pistol in .45 Colt caliber. Both of these pistols are of stronger construction than any of the other makes chambered for the .45 Colt cartridge." Chuck Hawks in "High Pressure Loads for the .45 Colt"