The .460 Rowland® is a proprietary cartridge designed and developed by Johnny Ray Rowland, host of "The Shooting Show." After first developing the new cartridge, Rowland worked with Starline Brass to finalize commercial production of the brass and later with .460 Rowland® to develop the first commercially available .460 Rowland® Conversions for specific versions of the M1911. First production shipments of ammunition and conversions were made through these associations in 1998.
"Years ago, when I first developed the .460 Rowland® cartridge, I was over at Clark Customs Guns here in Louisiana talking with my good friend and firearms mentor, Jim Clark, Sr. Mr. Clark informed me that he had discovered that the .45 ACP would shoot just fine in my new .460 Rowland® barrel and I have gone on to use this capability in actual practice and in my .460 Rowland® demonstrations ever since. I would think that after 16 or so years of experience in using the .45 ACP in my .460 Rowland® barrel and even mixing .45 ACP shells with my .460 Rowland® shells in the same magazine for practical and demo purposes, I should know by now whether or not it would be functional or rational to do so. And this is certainly a useful feature of the .460 Rowland® barrel-shell-gun concept: for converted guns to also be able to shoot the common .45 ACP ammo in addition to our Magnum power .460 Rowland® ammunition." -Johnny Rowland
The .460 Rowland® case is approximately 1/16" longer than a conventional .45 ACP case but the overall cartridge length is the same, the bullet is simply seated more deeply. The purpose of the extended case length is to prevent the high pressure .460 Rowland® from being chambered in a standard firearm chambered for the low pressure .45 ACP. This is similar to the relationship between the .357 Magnum and the .38 Special.
There are two key elements to the .460 Rowland® concept. The first is a sharp increase in cartridge maximum pressure over the .45 ACP and .45 Super. Maximum Average Pressure is: 45 ACP (21,000 PSI), .45 ACP +P (23,000 PSI), .45 Super (28,000 PSI), .460 Rowland® (40,000 PSI). The second is to damp or reduce the velocity of the slide in converted autoloading pistols to manageable levels. The first delivers magnum level performance and the second allows the cartridge to be easily and reliably fired from compact, light weight, high capacity, autoloading pistols.
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 .460 Rowland® Cartridge require a compensator or a ported barrel to ensure 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. 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.
High quality 1911 auto-loading pistols are manufactured by many different companies and tolerances vary with each manufacturer. As a result, adjusting recoil spring tensions and identifying specific magazines that works best in each individual gun have always been necessary to insure optimum performance from this 112 year old design. These same considerations are no less important when converting these guns to fire .460 Rowland® cartridges. Once installed, tested and adjusted in this manner, a 1911 / .460 Rowland® Conversion will shoot .45 ACP, +P, Super and .460 Rowland® cartridges accurately and reliably without ever having to revert to the factory barrel. Springfield XD / XDm, Glock 21 and Glock 30 auto-loaders and the SIG Sauer P220 are all made by a single manufacturer so similar adjustments are not often needed when these guns are converted to fire the .460 Rowland®.
The Ruger Blackhawk and Smith & Wesson Model 25/625 can also be chambered to fire the .460 Rowland®. These conversions require deepening the chambers and is effectively permanent unless the owner has a replacement cylinder fitted. For several years, Dan Wesson also made a revolver specifically made for the .460 Rowland®, which would also chamber .45 ACP, .45 Super and .45 Winchester Magnum, as does the Smith & Wesson Model 25/625. Both guns use moon clips and are very accurate fire arms.
Works With: 1911 Models, Glock 19, Glock 21, Glock 30, Springfield XD, Springfield XDm.
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