I am not going to get into an argument about it since I need Shawn to send me another cheekpiece being as I already used the one I ordered on a different rifle and now my new rifle is nearly done and it still needs a cheekpiece.
The acceleration of gravity is 32.2 ft per second squared.
The equations for calculating the velocity effect is 1/2 GxTxT. So for a time of travel of one second which would be about a 1,000 yard shot, the acceleration would generate a velocity of = 1/2x32.2x1x1 = 16.1 fps. If an angle is involved then multiply it by the sine. Thus, at 1000 yards we would see a small effect.
Now then lets us shoot at something 2000 yards away and things will get significant because "time of travel" is a squared function and it will take about 3.5 seconds to get there.
So the added or subtracted velocity = 1/2x 32.2x3.5x3.5 = 197 fps. Correct that for the angle of say 45 degrees and you get 197 fps x Sine 45 (0.707) = 139fps. (we use the sine function rather than the cosine function)
Being as one shot is uphill, its velocity is reduced by 137 fps and the other one is going downhill, its velocity is increased by 137 fps. So total difference is 274 fps by the time it reaches the target.
This is a simplified calculation that assumes the bullet path is a straight line and that is not true. The bullet travels along a curve and depending upon the angle a bullet fired uphill may actually start out going "up" but then change to "level" flight at some point and then tip over into "down" flight as it nears its target.
Think about things like this. If you go out in a boat and fire a 22 rifle straight up in the air gravity finally stops it and then begins to accelerate it back down and you will see and hear it "plunk" into the water. This is the simplest of all situations. If you have never done this then you simply don't meet minimum qualifications to be a redneck.
This is what I think. Perhaps I am wrong. It would not be the first time in my life I was wrong.
Anyway, I have no intentions of arguing about it. I use Exbal on my PDA and JBM on my PC.
The angle is all that matters from horizonal, it does not matter if it is up or down just that it is. A given 45 degree shot uphill is the same dope as the same shot but 45 degrees downhill.
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range it,check the wind, dial in correction, aim and only one shot
I don't mind friendly debate. I'll send you a cheekpiece anytime you want.
I was taught long ago it didn't matter if it was up or downhill and have applyed that in the field ever since without giving much thought to it other than the base theory. I have had great success with disregarding up or down. That being said I have not had opportunity to shoot up/downhill shots of huge distance and angle. 2000 yard shots with any angle at all (say over 15 degrees) just don't happen in this part of the world. What you say about the up/downhill gravity effect makes since to me I just have never seen it in the field ( that doesn't mean it isn't happening). I am sure that gravational deceleration occurs and will effect a given shot to a given extent. I beleive that few would ever have the occasion to shoot the distance and angle for it to be an issue. If the effect occurs at 3000 yards with an angle of 15 degrees or more I am not to worried about that. I will continue to teach that it doesn't matter, simply because it occurs at distances and angles rarely encountered by anyone. So I guess in my mind it is one of those issues where it does exist but is such a rare field occurance that it would only serve to confuse the subject and most people. It is an interesting issue and I am glad it was brought up. I like to know what is technically correct even if it doesn't effect my shooting.
As a side note to all who posted, this is likely the only civilized site left on the web lets keep it that way.
Huh, well no kidding. It's a great morning, I learned something new. Sure would have though that it would have been brought up some time ago though. None the less, great information to know.
pstimac, I'm terribly sorry for questioning your knowledge on the subject.
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I find it liberating not to have to be right all the time. 
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