Cooper Arms Model 52 Classic in 257 Roberts. The 257 Roberts is a cartridge with deep American heritage — wildcatted by Ned Roberts and standardized by Remington in 1934. Though somewhat overshadowed by the 25-06, the Roberts operates at lower pressure with excellent efficiency and is prized by hunters who appreciate its moderate recoil and deer-appropriate performance. Cooper's Model 52 Classic is a fitting home for this classic American round. Type: Rifle Action: Bolt-Action Caliber: 257 Roberts Capacity: 1 Year introduced: 1991, USA Weight: 60 oz Overall length: 43.5" Status: Active Intended use: hunting