30-378 WEATHERBY MAGNUM

The following data was developed in a Weatherby Mk V Accumark rifle. It came from the factory with a stainless steel fluted barrel, 26 inches long and a muzzle break installed. It was stocked in a gray synthetic stock. We installed a Leupold 4.5 14 X scope on it using Leupold bases and rings.

We used the Federal 215 primer in Weatherby brass. All groups are 3 shots at 100 yards.

To those of you who are interested in this kind of cartridge, you might have a look at our data on the 300 Pegasus. We found very noticeable throat erosion in that rifle after only about 50 rounds! We decided to check the throat of this rifle after every few rounds fired, and see if we can notice any difference in the throat. All our bullets were molly coated.

We had to stop using WMR and H870 powders as we were experiencing hang fire on every round.

50 rounds fired no noticeable throat erosion.

70 rounds fired slight erosion is noticeable just at the beginning of the rifling. It extends for about 0.040 of an inch.

100 rounds fired no noticeable increase from above.

125 rounds fired erosion is very noticeable, and the eroded area seems to have increased slightly.

POWDER

VELOCITY

GROUP

BULLET

       

112 H 5010

3101

0.550

NOSLER 165 BALLISTIC TIP

114

3161

0.536

 

116

3218

0.451

 

118

3286

0.522

 

120

3318

0.759

 

97 H 1000

2937

1.585

 

101

3018

0.448

 

105

3185

0.779

 

107

3240

0.432

 

109

3348

0.803

 

111

3410

0.784

 

116 H 5010

3249

1.415

NOSLER 150 BALLISTIC TIP

118

3325

1.021

 

120

3389

0.863

 

95 WMR

3147

1.224

 

99

3335

1.261

 

93 RELOADER 22

3159

1.092

 

96

3256

0.746

 

98

3343

0.822

 

100

3411

0.369

 

102

3469

0.779

 

104

3498

0.722

 

106

3521

0.469

 

108

3582

1.001

 

110

3698

0.718

 

86

2830

0.493

NOSLER 180 BALLISTIC TIP

89

2905

0.707

 

92

2988

0.665

 

95

3087

0.546

 

97

3105

0.995

 

99

3205

0.826

 

100 H 870

2869

1.195

 

112 H 5010

3144

0.696

 

114

3244

0.739

 

116

3298

0.654

 

118

3379

1.214

 

100

2698

1.107

SIERRA 220 MATCH KING

102

2740

1.314

 

104

2830

0.937

 

106

2913

0.656

 

108

2980

1.294

 

110

3053

0.723

 

112

3137

1.468

 
       
       

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Last updated 21 January 1999