.327 Federal Magnum
From Wikipedia, the free encyclopedia
| .327 Federal Magnum | ||
|---|---|---|
| Type | Revolver | |
| Place of origin | USA | |
| Production history | ||
| Designer | Federal Cartridge and Sturm, Ruger | |
| Designed | 2007 | |
| Produced | 2008-Present | |
| Specifications | ||
| Parent case | .32 H&R Magnum | |
| Case type | Rimmed, straight-walled | |
| Bullet diameter | .312 in (7.9 mm) | |
| Neck diameter | .337 in (8.6 mm) | |
| Base diameter | .337 in (8.6 mm) | |
| Rim diameter | .375 in (9.5 mm) | |
| Rim thickness | .055 in (1.4 mm) | |
| Case length | 1.20 in (30 mm) | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 100 gr (6.5 g) JHP | 1,400 ft/s (430 m/s) | 435 ft·lbf (590 J) |
| 115 gr (7.5 g) JHP | 1,300 ft/s (400 m/s) | 431 ft·lbf (584 J) |
| Test barrel length: 3 1/16" Source: Federal Premium and Ruger Introduce New Revolver Cartridge—the 327 Federal Magnum |
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The .327 Federal Magnum is a new cartridge introduced by Sturm, Ruger and Federal Cartridge, intended to provide the power of a .357 Magnum in six shot, compact revolvers, whose cylinders only hold 5 rounds of the larger .357 Magnum cartridge. Based on the .32 H&R Magnum, stretched and loaded to higher pressures, the .327 (actual bullet diameter .312 in, or 7.92 mm) achieves velocities up to 1,400 ft/s (430 m/s) with 100-grain (6.5 g) bullets (420 m/s and 6.5 g), and up to 1,300 ft/s (400 m/s) with 115-grain (7.5 g) bullets (390 m/s and 7.5 g), from the 3 1/16" (78 mm) barreled Ruger SP-101 revolver. The Ruger SP-101 chambered in the .327 Federal Magnum is due out January 2008.[1] [2]
[edit] Development
The .327 Federal Magnum is an attempt to improve on the .32 H&R Magnum, introduced in 1984, a round which failed to attract shooters or manufacturers. This is the third updated version of the original .32 S&W cartridge, which dates back to 1878. The original was a black powder cartridge with a case length of 0.61 in. (15 mm), which developed a velocity of around 700 fps (215 m/s).[3] The first improvement of the round came in 1896 with the introduction of the .32 S&W Long, which had a case length of 0.920 in (23.4 mm) and generated slightly higher velocities.[4] The introduction of the .32 H&R Magnum nearly a century later increased the case length to 1.075 in (27.3 mm) and pushed the pressure up from the very low 15,000 psi to 21,000 CUP, which is similar to .38 Special +P. This gave velocities of over 1,200 ft/s (365 m/s), a respectable increase, but was not enough to garner any great interest in the cartridge.[5]
While the .32 H&R Magnum is a near equivalent to the .38 Special +P, the .327 Federal Magnum reaches the velocity levels of the .357 Magnum, if not the same power, with velocities of up to 1400 fps (420 m/s) from the short-barreled Ruger SP-101. The case is 1/8" (3 mm) longer than the .32 H&R, and the pressure, at 45,000 psi, exceeds that of the .357 Magnum and approaches the level of the .454 Casull. Since the .327 still shares all case dimensions, excluding length, with the other .32 caliber cartridges going back to the .32 S&W, it can safely chamber and fire all four cartridges.[1][6][7]
[edit] Similar cartridges
The .327 Federal provides performance similar to the high velocity rifle loadings of the old .32-20 Winchester, though in much shorter barrel. Similar to the +P cartridges of today, the rifle loadings of these old cartridges were loaded to higher pressures than standard; they were discontinued because they could destroy .32-20 revolvers if fired in them. The .32-20, while long considered obsolete, has lived on in the sport of handgun metallic silhouette shooting, with handloaded rounds from single shot pistols like the Thompson Center Arms Contender far exceeding standard ballistics, and with the growing popularity of Cowboy action shooting, .32-20 lever action rifles are again being made. If chambered in a suitably modified .32-20 rifle, the .327 Federal should provide a significant boost over the .32-20.[6][8]
Another close comparison is the .30 Carbine, which has been offered in Ruger's single action Blackhawk revolver line since 1968.[9] The .30 Carbine was essentially the same ballistically as the .32 Winchester Self Loading, which was itself basically a rimless .32-20. The .327 Federal works at even higher pressure than the .30 Carbine (45,000 vs. 40,000 psi).[7][8] The long, 7 1/2 inch (19 cm) barrel of the .30 Carbine Blackhawk, with suitable loads for a handgun, offers performance levels with similar bullet weights in excess of the factory loaded .327 Federal, along with excellent accuracy. Those who favor the .30 Carbine in a revolver do so due to the excellent accuracy, flat trajectory, and low recoil, all of which the .327 Federal provide.[10] Both custom gunsmiths working with Ruger small fram single action Single Six and commercial maker Freedom Arms began offering conversions to convert .32 H&R revolvers to .327 Federal by early 2008. Test results from the long barreled guns showed even higher velocities than the .30 Carbine, along with excellent accuracy.[11]
[edit] References
- ^ a b Federal Premium and Ruger Introduce New Revolver Cartridge—the 327 Federal Magnum. Retrieved on 2007-11-27.
- ^ Dick Metcalf. Lethal Combination. Retrieved on 2007-11-27.
- ^ See main article, .32 S&W
- ^ See main article, .32 S&W Long
- ^ See main article, .32 H&R Magnum
- ^ a b Chuck Hawks. First Look: .327 Federal Magnum Revolver Cartridge.
- ^ a b SAAMI Pressure Specs.
- ^ a b Frank C. Barnes, ed. Stan Skinner. Cartridges of the World, 10th Ed.. Krause Publications. ISBN 0-87349-605-1.
- ^ Ruger Revolver Serial Number History. Sturm, Ruger.
- ^ John Taffin. Taffin Tests: .30 Carbine.
- ^ Jeff Quinn. reedom Arms Model 97 & Single Action Service Custom Ruger Revolvers Chambered for the New .327 Federal Magnum. GunBlast.com.
