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25-06 REM Centerfire Ammunition
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 to .257 caliber with no other changes. Nominal bullet diameter is 0.257, and bullet weights range from 75 to 120 grains.