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temps vs zero
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<blockquote data-quote="Bart B" data-source="post: 341006" data-attributes="member: 5302"><p>I've shot 1000 yard matches on one range in temperatures from 25 to almost 100 degrees. With my .308 Win., there's about a 4 MOA difference in sight elevation to zero the same load. But my .30-.338 only needed about 3 MOA change. It's probably a combination of powder temperature (low temps lowers velocity) and air temperature (lower causes bullets to slow down more).</p><p></p><p>If I keep a round in a hot chamber for more than 30 seconds, it'll shoot the bullet faster. About a 1/4th MOA come down in sight elevation's needed for every 30 seconds a .30-.338 round's in that hot chamber (every 20 seconds for a .308 Win.). I've made as many as six or seven 1/4 MOA come downs during the 3 to 4 minutes that rounds in the barrel, shot to call, then came back up that amount shooting the next round within 20 seconds of chambering it; the shot went to call.</p><p></p><p>So it's my experience that both powder and atmospheric temperature makes a difference. If you know what it is and how to correct for it, you'll do well at the longer ranges. It ain't rocket science; just grade school physics. Go do some tests with your rifle and its ammo then you'll know how much to correct.</p></blockquote><p></p>
[QUOTE="Bart B, post: 341006, member: 5302"] I've shot 1000 yard matches on one range in temperatures from 25 to almost 100 degrees. With my .308 Win., there's about a 4 MOA difference in sight elevation to zero the same load. But my .30-.338 only needed about 3 MOA change. It's probably a combination of powder temperature (low temps lowers velocity) and air temperature (lower causes bullets to slow down more). If I keep a round in a hot chamber for more than 30 seconds, it'll shoot the bullet faster. About a 1/4th MOA come down in sight elevation's needed for every 30 seconds a .30-.338 round's in that hot chamber (every 20 seconds for a .308 Win.). I've made as many as six or seven 1/4 MOA come downs during the 3 to 4 minutes that rounds in the barrel, shot to call, then came back up that amount shooting the next round within 20 seconds of chambering it; the shot went to call. So it's my experience that both powder and atmospheric temperature makes a difference. If you know what it is and how to correct for it, you'll do well at the longer ranges. It ain't rocket science; just grade school physics. Go do some tests with your rifle and its ammo then you'll know how much to correct. [/QUOTE]
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