Originally Posted by JLA
The .460 rowland will beat the hell out of any 1911 frame you put it in. Its simply too damn much pressure for the design.
Save it for the ARs.
.460 Rowland 40,000 psi, 10mm 37,500. I have a Colt Delta Elite chambered in 10mm and while I haven't shot it a great deal, I haven't had any problems nor have I heard any. I also have a .460 Rowland conversion set which includes barrel with compensator attached, recoil spring with guide and plug. I had it in a Springfield Armory slide and frame for a number of years. I wouldn't and didn't fire it a great deal, as I have my pistols chambered in 45 ACP but again, I haven't had any problems nor have I heard of any. The conversion set was made by Clark who as I'm sure you know is one of the premier gunsmiths in the U.S. The instructions go into great detail regarding the installation and ammo to be used. The reloading data keeps pressures in the 32,000 to 39,200 range.
Here is a cut and paste regarding the 460 Rowland conversion:
The increase in slide velocity over a standard .45 ACP, or even a .45 Super round, cannot be properly controlled with an increase in recoil spring rate alone. Autoloaders properly converted to fire the mighty .460 Rowland Cartridge require a compensator or a ported barrel to insure reliable, long lasting, operation. This fact not withstanding, there continues to be customer demand for a "Stock-Looking" .460 Rowland Conversion; however, any effort to answer this demand is thus-far not supported by the Inventor. Mr. Rowland still maintains that a properly designed .460 Rowland Conversion requires an effective compensator to momentarily delay slide action until the very high pressures developed by his cartridge dissipate to more manageable levels. Without this compensation, slide or frame failure will result over time and reliability will suffer in the short term. [Citation; Mr. Johnny Ray Rowland