Ruger GP100 .327 Federal Magnum
Sturm, Ruger & Co. · Revolver · In Production · 2015
Also known as: Ruger GP100 Seven-Shot, GP100 .327 Fed Mag
Overview
The Ruger GP100 in .327 Federal Magnum is a double-action revolver built on Sturm, Ruger's rugged GP100 platform. Chambered for the high-velocity .327 Federal Magnum cartridge, its seven-shot cylinder holds one more round than a comparable six-shot .357 Magnum, while the shorter, higher-pressure cartridge delivers flat trajectories and lower felt recoil. It uses a stainless-steel frame with a heavy full-length barrel shroud, a triple-locking cylinder, adjustable rear and replaceable front sights, and a cushioned Hogue Monogrip. The gun can also fire the milder .32 H&R Magnum, .32 S&W Long, and .32 S&W cartridges.
Specifications
| Weight (empty) | 1140 g (40.2 oz) |
| Overall Length | 241 mm (9.49") |
| Barrel Length | 107 mm (4.21") |
| Height | 149 mm (5.87") |
| Width | 39 mm (1.54") |
| Action Type | Revolving |
| Firing Mechanism | Hammer Fired |
| Trigger Type | Double Action |
| Trigger Pull | 33 N (7.4 lbf) |
| Magazine Capacity | 7 rounds |
| Magazine Type | Revolving Cylinder |
| Muzzle Velocity | 425 m/s (1394 fps) |
| Muzzle Energy | 585 J (431 ft·lbf) |
| Effective Range | 45 m (49 yd) |
| Barrel Rifling | Right Hand |
| Rifling Twist | 406 mm (15.98") |
| Number of Grooves | 6 |
| Frame Material | Stainless Steel |
| Barrel Material | Stainless Steel |
| Stock Material | Rubber |
| Finish | Satin Stainless |
Calibers
- .327 Federal Magnum · primary — also known as .327 Fed Mag
Features
- Firing modes: Manual
- Feed systems: Cylinder
- Safety mechanisms: Transfer Bar, Hammer Block
- Features: Full Length Barrel Shroud, Triple Locking Cylinder, Adjustable Rear Sight, Replaceable Front Sight, Seven Round Cylinder, Hogue Monogrip
Service history
Operators
- Civilian Sport and Self-Defense Market · adopted 2015
Production
Production years: 2015-present
One of several GP100 chamberings; the .327 Federal Magnum seven-shot model expanded the family alongside .357 Magnum, .44 Special, and 10mm Auto variants
Origin
Country of origin: United States
Designer: Sturm, Ruger & Co.
Notes
The seven-round cylinder gives an extra shot over six-shot magnum revolvers of similar size. The .327 Federal chambering also accepts .32 H&R Magnum, .32 S&W Long, and .32 S&W for lower-recoil practice.
Background
The GP100 was introduced in 1985 as a stronger successor to Ruger's Security-Six line, engineered around a solid frame with no side plate for exceptional durability. The .327 Federal Magnum chambering, added decades later, leveraged the platform's strength to safely handle the cartridge's high 45,000 psi working pressure while squeezing a seventh round into the cylinder.