4. Lilja. The smallest three-shot group I’ve ever fired at 100 yards, was fired with a Lilja barrel. It was on a heavy barreled 223 WSSM rifle built by custom rifle builder Charlie Sisk, and it ...

The rule for rifle barrel length was, if it was a standard cartridge, such as a .270 or a .30/06, 22 inches was the ideal length. For the smaller rounds, you could go as short as 20.