.256 Win. Mag.

Reloading data for .256 Win. Mag. cartridges and specifications for cases and loads in this caliber.
Product number: CID_233
Load data for caliber ".256 Win. Mag."
The .256 Win. Mag. is a powerful, yet highly controllable cartridge developed by Winchester in the late 1960s. It is based on a necked-down .357 Magnum case and uses a 9mm (.358) bullet, making it an ideal all-around option for those looking for accuracy and stopping power at the same time.

The .256 Win. Mag.'s flat trajectory and low recoil make it a great choice for both hunting and target shooting. Its high velocity also gives it excellent accuracy out to long distances, with some shooters reporting one-inch groups at 400 yards! When it comes to hunting medium game animals such as deer and antelope, the .256 Win. Mag. can do the job with ease thanks to its light but powerful bullets and deep penetration ability.
You find .256 Win. Mag. with all common powders and bullets by clicking the 'Loads in this caliber' button above.

Technical Specifications (based on the respective safety standard - see more details in tab 'Datasheet' if available)

Caliber: .256 Win. Mag.
Cartridge Type: Rimmed
Bullet Diameter: 0.256 '' | 6.5 mm
Primer Size: Large Rifle (LR)
Max. Case Length (l3):1.28'' | 32.54 mm
Max .Cartridge Length / OAL:1.59'' | 40.39 mm
Maximum Standardized Pressure:50764 psi | 3500 bar
The Commission internationale permanente pour l'épreuve des armes à feu portatives ("Permanent International Commission for the Proof of Small Arms" – commonly abbreviated as C.I.P.) is an international organisation which sets standards for safety testing of firearms. (The word portatives ("portable") in the name refers to the fact the C.I.P. tests small arms almost exclusively; it is ordinarily omitted from the English translation of the name.) As of 2015, its members are the national governments of 14 countries, of which 11 are European Union member states. The C.I.P. safeguards that all firearms and ammunition sold to civilian purchasers in member states are safe for the users.
To achieve this, all such firearms are first proof tested at C.I.P. accredited Proof Houses. The same applies for cartridges; at regular intervals, cartridges are tested against the C.I.P. pressure specifications at the ammunition manufacturing plants and at C.I.P. accredited Proof Houses.

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