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Shooting uphill vs downhill

 
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  #8  
Old 11-28-2008, 05:57 PM
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Join Date: Jan 2008
Posts: 30
Re: Shooting uphill vs downhill

If it's on TV it must be true...... Good reason to just go out and do some practise on targets shooting at differing ranges and angles. There is always knowledge of theory, but equally important is knowledge by experience.
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  #9  
Old 11-29-2008, 02:47 AM
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Join Date: Nov 2007
Location: British Columbia
Posts: 109
Re: Shooting uphill vs downhill

Quote:
Originally Posted by J E Custom View Post
It is amazing what you see on the tube and read in magazines.

And he was dead wrong ,As the guys said .

Kind of like the guy that had his rifle sighted in at 100yrds and said he killed his deer at 600yrds
by holding at the top of his back.

You cain't fix stupid

J E CUSTOM


Its only 70 inches of drop with my 338 edge at 600 yards with 100 yard zero. MUST BE BIG DEER THERE... lol
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  #10  
Old 12-03-2008, 01:41 AM
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Join Date: Mar 2005
Location: corpus christi,tx
Posts: 819
Re: Shooting uphill vs downhill

Quote:
Originally Posted by yama49 View Post
Its only 70 inches of drop with my 338 edge at 600 yards with 100 yard zero. MUST BE BIG DEER THERE... lol
that's why i hate going into gunshops,archery shops,sporting good store's, gun shows with all of the bull sht you can here or be told by the guys working at them. but it is kind of funny to set back and just lisen in at the start of the season.
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  #11  
Old 10-09-2009, 01:13 PM
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Join Date: Oct 2009
Location: Colorado
Posts: 13
Re: Shooting uphill vs downhill


Hi guys and gals.

this is my first post and yes there is a needed corection when shootoing up hill or downhill. Aim lower due to the following explanation.

Last fall in British Columbia I took a Mt Goat at 434 yds because I used a TBR rangefinder. Not my longest shoot every but it was the one in the most extreme conditions and slope.
Shooting Uphill and Downhill
By Chuck Hawks

The hoary old question of where to aim when shooting up or down hill regularly rears its head. It seems that many hunters understand that shooting at a steep angle changes the point of impact, but can't remember why or in which direction.
The correct answer is to hold lower than normal when shooting steeply up or down hill at long range. (At gentle angles you can ignore the problem altogether over the maximum point blank ranges of hunting rifle cartridges.)
This seems odd to many, and they insist on making the problem more difficult than it needs to be. But the reason is simple. Trajectory, the bullet's flight path, depends on the horizontal (level) range to the plane of the target, not the line of sight range up or down hill. Your eye sees the line of sight (slant) range from your position to the target, which is longer than the horizontal range.
Remember that it is gravity working on the bullet during its flight time that causes it to drop. If you were to shoot straight down, say from a tethered balloon, the bullet would have no curved trajectory, it would travel toward the earth in a straight line, just as if you simply dropped it. Likewise, if you shoot straight up, the bullet travels up in a straight line until its momentum is expended. Again, there is no curved trajectory.
You can infer from this that the farther from the level position a rifle is held when a bullet is fired, the less the bullet's drop will be over any given line of sight distance, whether it is fired up or down. Since your sights are set to compensate for bullet drop, and there is less bullet drop when shooting at an up or down angle, you must hold lower than normal to maintain the desired point of impact. For example, if you are shooting up or down at a 40 degree angle and the line of sight range is 400 yards to the target, the horizontal range is only 335 yards. 335 yards is the distance for which you must hold.
Leupold RX-III TBR display for example above.
Illustration courtesy of Leupold & Stevens,Inc.
The Leupold RX-III rangefinder that I reviewed for Guns and Shooting Online includes among its many features a mode that automatically compensates for up and down angle shots. Leupold calls this "true ballistic range" and you can set the RX-III's main readout to display the horizontal distance to the target, which is the distance you need to worry about in terms of trajectory. In the lower left corner of the display it also tells you the angle at which your are ranging and the line of sight range from your position to the target.
For example, if I range the top of a tall fir tree some distance from my house the line of sight range is 151 yards and the angle is 19 degrees of elevation, while the horizontal range--the true ballistic range--is only 130 yards. It is a neat rangefinder and a little time spent with one drives home the reality that, in terms of bullet trajectory, it is the horizontal, not the line of sight, range that matters.
__________________
W. Bruce Hutcheon, MBA
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