300 PEGASUS

The following data was developed in an A-SQUARE Hannibal model rifle. The rifle has a 26-inch very light barrel. The rifle came from the dealer with a Leupold 3.5 10X scope already installed, weighing in at 9.5 pounds.

We used the Federal 215 primer in A-SQUARE brass. Cartridge overall length was 3.790" with both bullets used in our tests. We thought it would be interesting to look at the throat after we fired about 50 rounds through this rifle. Just as well we did, there was definite signs of barrel erosion! It is pity that we did not look at the barrel before shooting it, just for comparison. A-SQUARE report getting 3505 fps with a 180 grain bullet and 123 grains of H870. We used 126 grains of powder and managed to get 3435 fps. This was a maximum charge for this rifle. This is definitely a long range hunting rifle, but personally I would have preferred a heavier barrel.

All groups are 3 shots at 100 yards. My friend Roy Vincent, a professional hunter from Zimbabwe fired them. Roy loves BIG guns, that is why we gave him the honor of doing all the load development for the 577 Tyrannosaur!

 

POWDER

VELOCITY

GROUPS

BULLET

       

118 H870

3162

0.779

BARNES X 180

120

3216

2.675

 

122

3257

0.886

 

124

3318

1.960

 

126

3435

1.214

 

100 H1000

3170

2.321

 

102

3234

1.633

 

104

3267

2.701

 

106

3300

2.197

 

124 H5010

3336

2.709

 

115 H870

3070

1.364

BERGER 190 HP

117

3154

2.695

 

118

3159

0.782

 

120

3133

2.794

DIFFERRENT LOT OF POWDER!

122

3134

3.314

 

124

3296

2.062

 
       
       
       
       
       

 

 

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