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.256 Mag. Gibbs
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Caliber Specifications:
Caliber: | .256 Mag. Gibbs |
Standard / Datasheet: | C.I.P. |
Bullet Diameter: | 0.256" | 6.50mm |
Primer Size: | Large Rifle (LR) |
Max. Case Length: | 2.173" | 55.19mm |
Max. Cartridge Length / OAL: | 3.050" | 77.47mm |
Max. Standardized Pressure: | 49313 psi | 3400 bar |
Case Capacity: | 56.0 Grains of Water | 3.64 cm3 |
CID: | CID_231 |
Last updated: | 2/20/2025 |
- The .256 Mag. Gibbs is a wildcat cartridge featuring an 8mm bullet and modified .30-06 case. Developed by Elmer Keith in the 1950s, it offers shooters and hunters alike an accurate, high-velocity round that packs a punch.The .256 Mag. Gibbs has been praised for its flat trajectory and low recoil, making it a great choice for target shooting or hunting medium-sized game such as deer and antelope. Its accuracy also makes it ideal for long-range shooting, with some shooters reporting one-inch groups at 200 yards.
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Most popular powders from our community members for caliber .256 Mag. Gibbs:
Weight vs. Velocity - Suitable Bullets for this Caliber
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Barrel Length Variation vs. Velocity - by Bullet Weight
.256 Mag. Gibbs load data available with the following bullets:
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There is also subsonic-load data available for this caliber.
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