The first .20-caliber produced in a large scale, the .204 Ruger arms shooters with a red-hot varminting round.
- The .204 Ruger was the first .20-caliber cartridge produced on a large commercial scale.
- Accurate, with a mild recoil, the .204 Ruger also offers excellent barrel life.
- The parent case of the .204 is a .222 Remington Magnum.
- It is necked down and given a 30-degree shoulder angle.
- The .204 performs best when shot out of a 26-inch barrel with a 1:12 twist.
The 204 Ruger uses the 47mm-long .222 Remington Magnum as its parent case, necking it down to accept .204 bullets and changing the shoulder angle to 30 degrees. It performs best with 26-inch barrels using a 1:12 rifling twist. The cartridge is available in Ruger, Dakota, Remington, and Savage bolt-action rifles, Thompson/Center and SSK Industries Contender single-shot rifles, and AR-15 style rifles. Hornady, Remington, and Winchester offer loaded ammunition.
Editor's Note: This article is an excerpt from Cartridges of the World 15th Edition.