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drop of bullet at 1000 yds

 
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  #1  
Old 10-17-2013, 12:47 AM
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drop of bullet at 1000 yds

saw long range purist the other day.they in thier tech part said the earth in shooting to 1000 yards if you shoot to the east then shoot to the west the bullets will drop a certain way because of the earths rotation.how would you figure this in to your drop figures in shooting at game?i do not see any of the shows adreeing this in their presentations.
gary b...
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Old 10-17-2013, 01:15 AM
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Re: drop of bullet at 1000 yds

The Coriolis effect is that of the earths rotation on a target while the bullet is in flight.
The best way to understand is to realize that the bullet leaves all contact with the earth the moment it leaves the barrel. While suspended in air, the earth is rotating underneath the bullet. When shooting west, the target (in contact with the earths surface) is rising due to the direction of the earths rotation. (Think sunrise and sunset, as the sun is essentially blocked out during sunset) Realize that this has nothing to do with the drop or path of the bullet, but rather the target moving. When shooting West, the target rises, and in order to compensate for this movement, you must Dope for a more exaggerated bullet drop. Most good ballistic programs have an additional data input regarding Coriolis effect. Long range shooting is all about understanding the different effects of atmospheric conditions, as well as how to utilize some very cool software. If shooting at ranges long enough to play with the Coriolis effect, every last thing comes into play.
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Old 10-17-2013, 08:32 AM
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Re: drop of bullet at 1000 yds

In the Northern hemisphere it also cause drift to the right which is also the same direction of spin drift in a right twist barrel.

Here ya go...



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Old 10-17-2013, 09:21 AM
wbm wbm is offline
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Re: drop of bullet at 1000 yds

I wouldn't factor compass direction effect for hunting game at all. Temperature, wind and elevation will have more impact on bullet trajectory than the earths rotation.
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Old 10-17-2013, 09:26 AM
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Re: drop of bullet at 1000 yds

Quote:
Originally Posted by wbm View Post
I wouldn't factor compass direction effect for hunting game at all. Temperature, wind and elevation will have more impact on bullet trajectory than the earths rotation.

You need to factor in ALL the factors
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Old 10-17-2013, 12:33 PM
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Re: drop of bullet at 1000 yds

Time of Flight, TOF is the most important aspect to consider before addressing CE, in my opinion. If you have 1 second TOF it is not going to have much affect. 5 seconds, it will have more. Therefore the further you shoot the more the variables play a role in LR accuracy.
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Old 10-17-2013, 04:51 PM
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Re: drop of bullet at 1000 yds

Two components to Coriolis. Horizontal defined by latitude (dist from equator) and vertical defined by direction you are shooting. Best explanation is from Bryan Litz in Applied Ballistics. I always use horizontal component on long range shots due to my high latitude. Use vert component unless shooting North/South so effect is zero. Coriolis and spindrift are significant at extended ranges.
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