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#3042490 - 11/20/12 05:30 PM Trajectory Question
Wannabe
Spike


Registered: 01/02/09
Posts: 32
Loc: Sumner County

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If I sight a .270 to zero at 100yds. Then shoot a target at 100 yds, that is at a 10% downhill grade. where whould the bullet hit? 100yds. up hill?
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#3042499 - 11/20/12 05:35 PM Re: Trajectory Question [Re: Wannabe]
mr.big
Non-Typical


Registered: 01/03/01
Posts: 28839
Loc: Copper Head Road

Offline
close enough to not even think about it,
_________________________
gun junky

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#3042531 - 11/20/12 05:52 PM Re: Trajectory Question [Re: mr.big]
Wannabe
Spike


Registered: 01/02/09
Posts: 32
Loc: Sumner County

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Then let's talk 200 - 300 - 400 ...
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#3042532 - 11/20/12 05:53 PM Re: Trajectory Question [Re: mr.big]
Wannabe
Spike


Registered: 01/02/09
Posts: 32
Loc: Sumner County

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The problem with not worrying about it is the extended ranges of 200, 300, 400, 500...
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#3042537 - 11/20/12 06:00 PM Re: Trajectory Question [Re: Wannabe]
Nhill
8 Point


Registered: 09/30/01
Posts: 1655
Loc: Maryville, TN

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The yardage does not matter, only the slope.

Angles 10 or less do not make any noticeable difference.

For angles greater than 10 degrees:
Multiply the slant range by .97 for a 15 degree angle
.87 for a 30 degree angle
.71 for a 45 degree slope.

For example if you had a 350 yard shot at 45 degrees, you would multiply 350*.71 and get 248.5. You would treat that shot as a 248.5 yard shot. It works the same for up or down hill slopes, you will hit high either way.

I don't quite understand it all,but that is what my ballistics book says.

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#3042630 - 11/20/12 06:46 PM Re: Trajectory Question [Re: Nhill]
FULLDRAWXX75
12 Point


Registered: 01/29/07
Posts: 6260
Loc: Adirondack Mtns, NY

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Slightly long read, but explains the whole thing pretty good..........

http://www.exteriorballistics.com/ebexplained/5th/33.cfm

FDXX75
_________________________
“Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.”
― Albert Einstein


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#3042706 - 11/20/12 07:43 PM Re: Trajectory Question [Re: FULLDRAWXX75]
Wannabe
Spike


Registered: 01/02/09
Posts: 32
Loc: Sumner County

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Thank you Fulldraw. That is exactly what I was looking for.
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