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Shooting from a slope downwards and upwards at angles.
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22-07-2010 7:02pm#1
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If you really want you can get a yoke to put on your scope to measure the angle of the shot, an angle collimeter
cosine indicator or something they're called. Past a certain severity of angle your bullet will hit HIGH shooting uphill/downhill, so you need to aim LOW. As usual, the best way to find out is to practice 
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When shooting up or down hill, true, gravity accelerates your round straight down. It is the horizontal distance that you must consider when shooting and not the up/down hill distance.
As for where to aim, that's another point entirely. Suppose you are shooting on a hill such as this, the classic 3, 4, 5 triangle studied in school.
For our case, suppose the triangle represents 300yards, 400yards, and 500 yards.
If you are at the top a deer at the bottom is 500 yards walking distance down the hill from you.
However, that's not the distance you want to setup in the reticle. You have to use your scope as if the deer is 400yards away. Since the horizontal distance is always less whether shooting uphill or downhill, you always aim low.
This involves knowing the angle, slope, horizontal distance, or some combo and making a quick and easy calculation. I bought and am waiting to receive the Leica 1600 which has an internal ballistics program that does the work for you.
Now there's more. What round does your firearm shoot? What's the trajectory that the bullet flies? In general, bullets are pretty fast and the reticles used should be spot on for any caliber.
However, have a look at this chart
http://www.burrisoptics.com/pdf/BMDotLabels4.pdf
All of the reticles have the same cross mark spacings, however, you should note that depending on the bullet and its mass, those markings change the actual corresponding distance. I think this is the type of chart you are looking for.
Here's a comparison for the Ruger 204 (4220 feet/s) and the Springfield 30-06 (150 gr) (2900 feet/sec). The numbers correspond to the different distance for the same cross marks using different rounds.
Ruger 204: 100, 225, 350, 450, 650, and 750
Sprg 30-06: 100, 200, 300, 400, 460, and 550
The Ruger, being the hotter round flies "flatter." Note that the second marking on the reticle is a distance greater than 200ya. Again, since this round flies so fast, it drops less, and if you set your cross hair up at the second mark, the round hits dead center at 225 ya not 200 ya.
First, note that within 300 yards, across all calibers, the scope isn't going to be a problem as to hit or miss. Across all calibers, I bet there will not be much of a drop difference at all if you zero at 100ya and use the reticle in 100 ya increments there after out to 300 or 400 yards.
The problem is when you shoot long distances. The speed of the bullet decreases exponentially. When shooting out past 600 or 700 yards, the problem will be magnified.
Hope this helps, here's a little more light reading
http://www.burrisoptics.com/pdf/BALLPLEX.pdf
You should check the webSite of the manufacturer of your scope for any such info. Also, you may wish to do the same for your ammo.0 -
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When shooting up or down hill, true, gravity accelerates your round straight down. It is the horizontal distance that you must consider when shooting and not the up/down hill distance.
As for where to aim, that's another point entirely. Suppose you are shooting on a hill such as this, the classic 3, 4, 5 triangle studied in school.
For our case, suppose the triangle represents 300yards, 400yards, and 500 yards.
If you are at the top a deer at the bottom is 500 yards walking distance down the hill from you.
However, that's not the distance you want to setup in the reticle. You have to use your scope as if the deer is 300yards away. Since the horizontal distance is always less whether shooting uphill or downhill, you always aim low.
This involves knowing the angle, slope, horizontal distance, or some combo and making a quick and easy calculation. I bought and am waiting to receive the Leica 1600 which has an internal ballistics program that does the work for you.
Now there's more. What round does your firearm shoot? What's the trajectory that the bullet flies? In general, bullets are pretty fast and the reticles used should be spot on for any caliber.
However, have a look at this chart
http://www.burrisoptics.com/pdf/BMDotLabels4.pdf
All of the reticles have the same cross mark spacings, however, you should note that depending on the bullet and its mass, those markings change the actual corresponding distance. I think this is the type of chart you are looking for.
Here's a comparison for the Ruger 204 (4220 feet/s) and the Springfield 30-06 (150 gr) (2900 feet/sec). The numbers correspond to the different distance for the same cross marks using different rounds.
Ruger 204: 100, 225, 350, 450, 650, and 750
Sprg 30-06: 100, 200, 300, 400, 460, and 550
The Ruger, being the hotter round flies "flatter." Note that the second marking on the reticle is a distance greater than 200ya. Again, since this round flies so fast, it drops less, and if you set your cross hair up at the second mark, the round hits dead center at 225 ya not 200 ya.
First, note that within 300 yards, across all calibers, the scope isn't going to be a problem as to hit or miss. Across all calibers, I bet there will not be much of a drop difference at all if you zero at 100ya and use the reticle in 100 ya increments there after out to 300 or 400 yards.
The problem is when you shoot long distances. The speed of the bullet decreases exponentially. When shooting out past 600 or 700 yards, the problem will be magnified.
Hope this helps, here's a little more light reading
http://www.burrisoptics.com/pdf/BALLPLEX.pdf
You should check the webSite of the manufacturer of your scope for any such info. Also, you may wish to do the same for your ammo.
Fisma,
Tanx very much for such detailed information. I take my hat off to you far play. You have given plenty homework to study. And i can now by reading it understand better.:)
Tanx to all for replys!:)
Kill Joy.0 -
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