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.257 Roberts (257 Roberts +P)
Back in the 1920's, N.H. (Ned) Roberts spent several years testing a number of .257" caliber wildcats on various cases. Probably upon suggestion of Charles Newton, Roberts finally settled on the 7 x 57mm Mauser case for his cartridge. Adolph Neidner built most of his test rifles, and Col. Townsend Whelen named the cartridge .25 Roberts. The final version of Roberts wildcat had an extremely long neck and mild shoulder angle. The cartridge quickly became quite popular and other firms such as Griffen & Howe and Sedgley chambered rifles for it.
In 1934, Remington simply necked down the 7 x 57mm case, retaining its original body taper and shoulder angle. About the only things the Roberts and Remington cartridges had in common were parent case and caliber. But, since Roberts had devoted so much of his life to his wildcat, it was only fitting that the new cartridge be called .257 Remington-Roberts.
