.257 Weath. Mag.
Reloading data for .257 Weath. Mag. cartridges and specifications for cases and loads in this caliber.
Product number: CID_247
Load data for caliber ".257 Weath. Mag."
The .257 Weatherby Magnum is a high velocity cartridge developed by Roy Weatherby in the 1950s. It is based on a stretched .300 H&H case and uses a .257 caliber bullet, giving it outstanding performance for long-range shooting or hunting big game animals such as elk and bighorn sheep.The .257 Weatherby Magnum is known for its excellent accuracy and flat trajectory, making it an ideal choice for serious target shooters or hunters looking to take down large animals at long distances. Its high velocity also gives it impressive energy levels and great penetration, ensuring reliable performance no matter what type of game you're hunting.
You find .257 Weath. 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: | .257 Weath. Mag. |
|---|---|
| Cartridge Type: | Magnum |
| Bullet Diameter: | 0.257 '' | 6.53 mm |
| Primer Size: | Large Rifle Magnum (LRM) |
| Max. Case Length (l3): | 2.55'' | 64.74 mm |
| Max .Cartridge Length / OAL: | 3.17'' | 80.52 mm |
| Maximum Standardized Pressure: | 63817.6 psi | 4400 bar |
C.I.P.
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.