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|Place of origin||United States|
|Designer||Johnny Ray Rowland|
|Produced||1998 – Present|
|Bullet diameter||.451 in (11.5 mm)|
|Case length||.957 in (24.3 mm)|
|Overall length||1.275 in (32.4 mm)|
|Primer type||Large pistol|
|Test barrel length: 5.5 in
Source(s): *Citation Needed
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 Jim Clark, Jr. of Clark Custom Guns 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.
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.
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.
Available pistols (not conversions)
.460 Rowland offers the Authentic .460 Rowland Cartridge. Wilson Combat offers the Wilson Hunter, a 7-shot semiautomatic pistol, in either 10mm or .460 Rowland. Clark Custom Guns, Inc. introduces "460 Rowland Huntsman" 7 shot 1911 semi-automatic.
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.
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.
- "1911 Hot Rods". Handguns. Outdoor Sportsman Group. June 17, 2009. Archived from the original on June 17, 2009. Retrieved November 13, 2012.
- "About .460 Rowland". 460 Rowland. Retrieved February 18, 2015.
- "Wilson Hunter". Wilson Combat 2013. Retrieved November 13, 2013.
- "Clark Custom Guns 460 Rowland Huntsman 1911". Clark Custom Guns. Retrieved October 27, 2014.
- Johnny Ray Rowland & .460 Rowland LLC