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Old 08-09-2012, 04:41 PM
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CircuitRider CircuitRider is offline
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Third: There were the two groups I fired using the 250gr Barnes and was 5% with below published max with one group and 4% below max with the other group, giving me from 2701 2720fps as I was testing in the margin of safety to make sure I did not get close to max pressures with this very soft bullet. Of course I will now increase my charges moving toward max hoping to be over 2750 2800fps with an accurate load. Group sizes were as follows as I increased the powder charge from 5% to 4% below max. Best group was .447 with Extreme Spread of 22 and Deviation of 11, and worst group was .8485 with Extreme Spread of 22 and Deviation of 11.
Three shot group .447", 250gr Barnes Original 2720fps

Three shot group .8485" , 250gr Barnes Original 2701fps
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