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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2009 at 22:27
helo18 View Drop Down
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Ok, so this really is a crazy question maybe, or a couple.

1.  What is the simplest way to calculate the drift of a bullet at that range for the Coriolis effect of the earth? Bullet flight time is 3.076 seconds.

2.  Based on my calculations, based on a 180 gr Interbond @ 3100 fps, 4500 feet, 40F, 46% humidity, the bullet will drop 102 feet at a mile with a 200 yard zero.  So assuming a standard lapse rate, you will gain .102 inches in pressure and .171 degrees in that time.  How significant is this going to be at a mile?  And how much will that translate in drop at that range?

I am curios to see if I could try a shot like that.  We have the range to do it on the farm.  I have been shooting at 1000 to 1200 yards.  I am not that good by any means, but it would be fun to try it.  What do you guys think?

Edited to correct a mistake in the numbers.


Edited by helo18 - January/30/2009 at 22:38
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/30/2009 at 23:44
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Drew I gotta get out to your neck of the woods..... er.......  flatland........ er......  Country!!!!
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 00:26
helo18 View Drop Down
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You know you are welcome anytime you want to come.  Flatland, woods, mountains.  Take your pick, I can give it to you in a very short drive!

Just a warning though.  If you spend a little time up here, you may find yourself hopelessly addicted!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 04:22
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Why a a 200 yard zero? Why not 500 or 700?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 09:36
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David Tubb did a witnessed  mile shot offhand on a Florida beach.
If my math is correct, depending on which compass direction you'd be facing you could be looking at a 17 inch offset.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 10:10
helo18 View Drop Down
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Originally posted by silver silver wrote:

Why a a 200 yard zero? Why not 500 or 700?


I will probably end up with a 1000 yard zero if I want to try it.  I can dial the scope in easy enough at that range.  Not sure how much movement I have after that.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 10:14
helo18 View Drop Down
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Originally posted by Mike McDonald Mike McDonald wrote:

David Tubb did a witnessed  mile shot offhand on a Florida beach.
If my math is correct, depending on which compass direction you'd be facing you could be looking at a 17 inch offset.


I can shoot any direction but east.  Right now the best setup is shooting north.  Do you have a formula you could post your calculation?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 17:07
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Go to this site:

http://www.eskimo.com/~jbm/calculations/mpm/mpm.html
This model will calculate it for you.  


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 17:49
helo18 View Drop Down
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I do a lot of my ballistics through them.  I usually use the simpler page though.  Thanks for the link.  I will try to find all that info on my bullets and pug it in.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 19:07
Mike McDonald View Drop Down
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Helo, I'd love to but it took me an hour to do it longhand, I could hardly wait to see the look on Chris's face while he wonders where all his bandwidth went.  :)
 
Besides, JBM said I was in error by 2.568 inches.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/31/2009 at 19:22
helo18 View Drop Down
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Now I am really curious to see the equation!  Could the 2 in error have anything to do with which direction you calculated it and what lat and long you are at?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/29/2009 at 01:58
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Very impressive Mike.
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