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Do you shoot at significantly different geographic elevations?

This is a discussion on Do you shoot at significantly different geographic elevations? within the Accuracy forums, part of the M14 M1A Forum category; One area I shoot at is about 2800 feet. Another is about 3700 feet. There is a difference in results. The ballistics programs have this ...


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Old March 3rd, 2017, 11:24 PM   #1
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Do you shoot at significantly different geographic elevations?

One area I shoot at is about 2800 feet. Another is about 3700 feet. There is a difference in results. The ballistics programs have this dialed in pretty good.

I have not been up to the 7000 foot elevations with the M1A.

What are your experiences with greater differences and what adjustments do you make?

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Old March 4th, 2017, 04:16 PM   #2
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I shoot at elevations ranging from 50 feet to 150 feet here on the coastal plains of Texas, so I don't notice much difference.

I do notice a different in accuracy between the elevation of prone and the elevation of standing.

I definitely believe humidity does effect things.

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Old March 4th, 2017, 04:55 PM   #3
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I have fired different elevations from 350' in south San Jose, then in Albuquerque Shooting Park at 5,296' and 6,702 at the NRA Whittington Center in northern New Mexico. I have never seen a real difference show up with commercial ammunition. I even have not seen any real difference with temperatures from 25F up to 103F with military surplus ammunition. And I have fired a whole lot of it... Mil Surplus ammunition manufactures for the 7.62x51mm >16k rounds down range over the last 14 years.


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Old March 4th, 2017, 07:50 PM   #4
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Originally Posted by XXIV Corps View Post
I have fired different elevations from 350' in south San Jose, then in Albuquerque Shooting Park at 5,296' and 6,702 at the NRA Whittington Center in northern New Mexico. I have never seen a real difference show up with commercial ammunition. I even have not seen any real difference with temperatures from 25F up to 103F with military surplus ammunition. And I have fired a whole lot of it... Mil Surplus ammunition manufactures for the 7.62x51mm >16k rounds down range over the last 14 years.

Good to know. That is the data point I was looking for. The Hornady advanced calculator I use says there should be a difference. But I have not shot the 16K rounds to separate random performance variations from the effects of real atmospheric conditions.

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Old March 4th, 2017, 08:36 PM   #5
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Here in eastern Mass it's from sea level to maybe 1,000 ft. That's about it.

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Old March 4th, 2017, 10:18 PM   #6
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You will see a notable difference in two different altitude's affects on a bullet's ballistics at longer ranges.
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Old March 4th, 2017, 10:24 PM   #7
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You will see a notable difference in two different altitude's affects on a bullet's ballistics at longer ranges.
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That makes sense. I am only going out to 200 yd. Flight time to 600 or more is bound to show some difference.

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Old March 5th, 2017, 07:01 AM   #8
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Higher altitude=thinner air=less drag.

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