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.

 

POWDER

VELOCITY

BULLET

124.5 REL 19

2314

BARNES 700 SP

125.5

2338

 

126.5

2378

 

128.5

2409

 

124.0 IMR 4350

2350

BARNES 600 SP

127.0

2448

 

128.0

2473

 

130.0

2507

 

132.0

2539

 

134.0

2571

 

136.0

2604

 

115.0 REL 15

2416

 

116.0

2437

 

126.0 VVN 560

2317

BARNES 700 SP

  A-SQUARE FACTORY LOAD

2346

600 LION LOAD