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.255 GS
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Caliber Specifications:
Caliber: | .255 GS |
Standard / Datasheet: | C.I.P. |
Bullet Diameter: | 0.257" | 6.53mm |
Primer Size: | Large Rifle (LR) |
Max. Case Length: | 2.165" | 54.99mm |
Max. Cartridge Length / OAL: | 2.854" | 72.49mm |
Max. Standardized Pressure: | 63817 psi | 4400 bar |
Case Capacity: | 62.0 Grains of Water | 4.03 cm3 |
CID: | CID_229 |
Last updated: | 2/20/2025 |
- The .255 GS (or .255 Gibbs Splinter) is a little-known, yet highly effective cartridge developed by Elmer Keith in the mid 1950s. It is based on the .30-06 case and uses a 9mm bullet, making it perfect for those looking for an accurate, lightweight option.
The .255 GS is often used by hunters and target shooters due to its flat trajectory, low recoil and pinpoint accuracy. Its low powder charge helps to make shooting pleasant, while its relatively light bullets still pack a punch when they hit the target.
The .255 GS was designed with hunting medium game animals such as deer, antelope and wild boar in mind. It can also be used effectively to hunt smaller game, such as coyotes, foxes and hares. The versatile round has earned a reputation among hunters for its ability to take down even larger animals with ease. 
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Weight vs. Velocity - Suitable Bullets for this Caliber
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Barrel Length Variation vs. Velocity - by Bullet Weight
.255 GS load data available with the following bullets:
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