Nominal bullet diameter of the .257 Roberts is .257 inches (6.5 mm). The .257 Roberts uses the same caliber bullets as .250 Savage or the more powerful .25-06 Remington.

Mar 18, 2021 · The .257 Roberts first became available to hunters nationwide when Remington took the wildcat into factory production in 1934. It was developed by gun writer and experimenter N.H Roberts …

rican big game hunting. Pushed out of the limelight when the 243 Winchester and 6mm (244) Remington came along, the 257 is still an excellent cartridge. Although a bit light for larger big game species, …

Jun 5, 2025 · Rarely chambered today, there are still a lot of .257 Roberts rifles in use, adequate factory loads and 90 years of loading data. It’s still fast, flat-shooting, light-kicking, and versatile.

The .257 Roberts was designed in the 1920s when wildcatter Ned Roberts started to do experiments on the .257 caliber cartridges. After some work he decided to go with a 7x57 Mauser as the parent case …

The .257 Roberts is a low recoiling, mild powered cartridge. In a short action, it has the potential for a suitable youth rifle but without care towards optimizing hand loads, can lack the power with many …

The fine .257 Roberts is based on a necked-down 7mm Mauser case, and was legitimized by Remington in 1934. From then until the introduction of the hot .243 Winchester and .244/6mm …

Oct 23, 2025 · Explore the 257 Roberts cartridge, its history, specifications, and applications for hunting and shooting enthusiasts.

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Dec 13, 2023 · The .257 Roberts has lost none of the versatility that Jack O’Connor wrote about many years ago. In fact, with modern bullets and more versatile powders than were available back then, it …