.460 Rowland

.460 Rowland
Type Pistol
Place of origin United States
Production history
Designer Johnny Ray Rowland
Produced 1998 – Present
Specifications
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
Ballistic performance
Bullet weight/type Velocity Energy
80 gr (5 g) 3,050 ft/s (930 m/s) 1,680 ft·lbf (2,280 J)
185 gr (12 g) JHP 1,560 ft/s (480 m/s) 1,000 ft·lbf (1,400 J)
230 gr (15 g) JHP 1,340 ft/s (410 m/s) 930 ft·lbf (1,260 J)
230 gr (15 g) FMJ 1,340 ft/s (410 m/s) 930 ft·lbf (1,260 J)
300 gr (19 g) (Revolver Only) 1,350 ft/s (410 m/s) 1,230 ft·lbf (1,670 J)
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 .460 Rowland and Clark Custom Guns to develop the first commercially available .460 Rowland Conversions for specific versions of the M1911.[1] First production shipments of ammunition and conversions were made through these associations in 1998.

Design

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.[2] Wilson Combat offers the Wilson Hunter, a 7-shot semiautomatic pistol, in either 10mm or .460 Rowland.[3] Clark Custom Guns, Inc. introduces "460 Rowland Huntsman" 7 shot 1911 semi-automatic. [4]

Conversions

Model 1911 pistol with .460 Rowland conversion. The 1.5" compensator works in conjunction with a 22 to 24 pound recoil spring to effectively control slide velocity and recoil.

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.[5]

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.

[Citation; Johnny Ray Rowland & .460 Rowland LLC]


See also

References

  1. ↑ "Internet Archive Wayback Machine". Web.archive.org. 2009-06-17. Archived from the original on 2009-06-17. Retrieved 2012-11-13.
  2. ↑ 460 Rowland 2015. ".460 Rowland". Retrieved 2015.
  3. ↑ Wilson Combat 2013. "Wilson Hunter". Retrieved 2013-10-13.
  4. ↑ Clark Custom Guns 2014. "Clark Custom Guns 460 Rowland Huntsman 1911". Retrieved 2014-10-27.
  5. ↑ Matrix Group International, Inc. Alexandria, Virginia 2003. "View Article". Police Chief Magazine. Retrieved 2012-11-13.

[1]

External links

  1. ↑ .460 Rowland|accessdate=2015
This article is issued from Wikipedia - version of the Tuesday, February 16, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.