257 WEATHERBY MAGNUM

The following data was developed in a custom rifle built by August Francotte of Belgium. It is based on a Sako magnum action. The rifle has a heavy barrel of 25 inches. It also has Weaver 4-16X scope mounted in an EAW rings and bases.

We used the Winchester large rifle magnum primer in Weatherby brass throughout our tests. All bullets were molly coated. All groups are 3 shots at 100 yards.

POWDER

VELOCITY

GROUP

BULLET

       

70.0 VVN 160

3666

1.699

SIERRA 75 HP

71.5

3739

2.667

 

73.0

3798

0.926

 

70.0 H 4831

3321

0.826

HORNADY 75 V-MAX

71.5

3416

0.921

 

73.0

3527

1.012

 

74.5

3632

1.875

 

76.0

3711

1.025

 

70.0 VVN 165

3445

0.837

NOSLER 85 B.TIP

72.0

3483

0.875

 

74.0

3610

1.009

 

66.0 VVN 160

3452

1.844

 

67.5

3507

0.429

 

69.0

3547

1.727

 

70.5

3619

1.865

 

63.0 H 4831

3095

1.265

NOSLER 100 B. TIP

64.5

3144

0.838

 

66.0

3188

0.600

 

67.5

3220

1.086

 

69.0

3288

1.708

 

70.5

3377

1.177

 

67.0 VVN 165

3251

1.955

 

68.7

3295

0.993

 

70.0

3336

1.183

 

71.5

3396

2.313

 

73.0

3466

3.590

 

74.5

3569

1.141

 

62. RELOADER 22

3007

1.243

SPEER 120 SP

63.5

3049

0.826

 

65.0

3105

0.910

 

66.5

3134

0.382

 

68.0

3194

1.898

 

71.0 H 1000

3187

0.457

 

72.5

3332

1.593

 

74.0

3187

0.457

 

73.0 H 870

2912

1.231

 

74.5

3024

0.716

 

76.0

3061

0.820

 

77.5

3105

0.962

 

79.0

3163

1.782

 
       
       
       
 

 

Powder

Velocity

Group

Bullet

C O A L

75.0 H 870

3099

1.975

Barnes X 115 Molly coated

3.166

76.0

3110

1.776

 

 

77.5

3126

1.114

 

 

79.0

3195

1.556

 

Compressed

80.5

3256

0.852

 

Compressed

70.0 H 1000

3208

0.458

 

 

71.5

3304

0.316

 

 

73.0

3404

1.774

 

 

65.0 Reloader 22

3087

1.093

 

 

66.5

3175

2.137

 

 

68.0

3229

0.625

 

 

69.5

3380

0.849

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Last updated May 26th, 2007