25-06 Remington

The .25-06 Remington had been a wildcat cartridge for half a century before being standardized by Remington in 1969. It is based on the .30-06 Springfield cartridge necked-down (case opening made narrower) to .257 caliber with no other changes. Nominal bullet diameter is 0.257 inches (6.53 mm) and bullet weights range from 75 to 120 grains (4.9 to 7.8 g). [Wikipedia]