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Hunting
Long Range Hunting & Shooting
UPDATED: Head scratching day at the range
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<blockquote data-quote="emp1953" data-source="post: 2580919" data-attributes="member: 71817"><p>I helped a friend develop a load for a .270win model 70. We came up with a dandy, loaded up 200 rounds and on the day we finally zeroed it in it was 80 degrees and overcast. We came back the next week, firing the same batch, all the same conditions, with 1/4 moa groups opening up to over 1 moa. The only difference being bright sunshine. The ammo was exposed to the sun and heated up. Changed things dramatically. Had nothing to do with the rifle, or the shooter, or actually none of the components, it was the environment that had changed. We had signs of over pressure too. There were 20 rounds left from the original loading session which we brought out several weeks later. We kept the ammo out of the sun, and went back to 1/4 moa groups. Just goes to show there is always something unexpected to bite you in the ***.</p></blockquote><p></p>
[QUOTE="emp1953, post: 2580919, member: 71817"] I helped a friend develop a load for a .270win model 70. We came up with a dandy, loaded up 200 rounds and on the day we finally zeroed it in it was 80 degrees and overcast. We came back the next week, firing the same batch, all the same conditions, with 1/4 moa groups opening up to over 1 moa. The only difference being bright sunshine. The ammo was exposed to the sun and heated up. Changed things dramatically. Had nothing to do with the rifle, or the shooter, or actually none of the components, it was the environment that had changed. We had signs of over pressure too. There were 20 rounds left from the original loading session which we brought out several weeks later. We kept the ammo out of the sun, and went back to 1/4 moa groups. Just goes to show there is always something unexpected to bite you in the ***. [/QUOTE]
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UPDATED: Head scratching day at the range
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