top of page
.257 Roberts
You need to be a member to bookmark a load !
Caliber Specifications:
Caliber: | .257 Roberts |
Standard / Datasheet: | C.I.P. |
Bullet Diameter: | 0.256" | 6.50mm |
Primer Size: | Large Rifle (LR) |
Max. Case Length: | 2.233" | 56.72mm |
Max. Cartridge Length / OAL: | 2.775" | 70.48mm |
Max. Standardized Pressure: | 51488 psi | 3550 bar |
Case Capacity: | 56.0 Grains of Water | 3.64 cm3 |
CID: | CID_241 |
Last updated: | 2/20/2025 |
- 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.
Weight vs. Velocity - Suitable Bullets for this Caliber
Add paragraph text. Click “Edit Text” to update the font, size and more. To change and reuse text themes, go to Site Styles.
Barrel Length Variation vs. Velocity - by Bullet Weight
.257 Roberts load data available with the following bullets:
(most popular first)
Filter by Bullet Weight (Grains)
bottom of page