.257 Roberts
Reloading data for .257 Roberts cartridges and specifications for cases and loads in this caliber.
Product number: CID_241
Load data for caliber ".257 Roberts"
The .257 Roberts is a centerfire rifle cartridge that was introduced by Remington Arms in 1934. It is based on the 7x57mm Mauser cartridge case, necked down to accept .257" caliber bullets. The cartridge is known for its accuracy and flat trajectory, making it popular for hunting small to medium-sized game at moderate ranges.
The .257 Roberts has a maximum average pressure of 54,000 psi and can be loaded with bullet weights ranging from 75 to 120 grains. It is commonly used for hunting deer, antelope, and other similar-sized game, as well as varmints.
The popularity of the .257 Roberts has declined in recent years, with many hunters opting for newer cartridges that offer similar performance. However, it still has a dedicated following among hunters and shooters who appreciate its accuracy and versatility.
You find .257 Roberts 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 Roberts |
|---|---|
| Bullet Diameter: | 0.256 '' | 6.5 mm |
| Primer Size: | Large Rifle (LR) |
| Max. Case Length (l3): | 2.23'' | 56.72 mm |
| Max .Cartridge Length / OAL: | 2.78'' | 70.48 mm |
| Maximum Standardized Pressure: | 51489.2 psi | 3550 bar |