500 A-Square

The following data was developed by my friend Mitch Carter, in a custom rifle built on a Weatherby Mk V action. It originally was a 460 Weatherby. This rifle had a 26" McGowan barrel, with a 1 in 12 twist, and a muzzle brake was also installed by McGowan. Mitch noted that this rifle is more accurate with the 700 grain bullets than the 600, which might be due to the fast twist barrel. The 500 A-Square is a necked up and improved 460 Weatherby. 460 Weatherby brass was used, and the Federal 215 primers.