We had spotted the buck from the top of the steep canyon about 45 minutes previously and had since that moment been slipping and sliding down the rock strewn hillside, while trying to stay hidden from our still unsuspecting target. This stalk down the treacherous slope was more reminiscent of a sheep hunt than the pursuit of a whitetail deer but as I had explained previously to my present hunting partner six months ago, our whitetail in the Salmon River breaks have habits more akin to mule deer than their Virginianes brethren. Read More...
very good article. no doubt uphill/downhill shooting is more complex than most of us realize. im sure most hunters pay little attention to it.
it is very important to take cousine into account when setting up for a shot. the longer the distance the more important it becomes.
there are inexpensive ways of accuratly getting the information with basic tools and a prepared chart or a small calculator.
it can become as complicated as we wish to make it. and it can change as wind and other conditions change.
long range shooting is not an exact science, much as many think it is or might like it to be.
the most important thing, as the auther pointed out, is the fact that a spotter is absolutly essential for successful long range hunting.
both deer in the article were in fact taken. without the spotter that might not have been the case.
there are lots of reasons why a shot could be a close miss. not the least of which could be an obscure branch.
Hey Guys. I think this is simply a trigonometry equation. Gravity only effects the horizontal distance. For flat shooting gravity affects bullet the entire distance but uphill-downhill it only effects part of the shot. As you change the Shooting Angle the Distance Affected By Gravity changes.
DOWN - Actual Distance x sin(shooting angle) = Distance Affected By Gravity
UP - Actual Distance x cos(shooting angle) = Distance Affected By Gravity
Lets use 400y@ 60d down. 400 x sin(60) = 346.4
Adjust your scope for 346.4 yards
The 2 previous posts are correct, good education and application of physics. The problem is extrapolated data vs. observable data. calculated is a static measurement or basically single point calculation. Bullet trajectory is dynamic ever changing and requires practically infinite points of calculation to arrive at an actual result and then that result is only valid for that exact set of variables. Direct observation can go backwards and correct itself with fudge factoring becoming dynamic, where math will insist that the bullet trajectory conforms to it, or becomes static. I can't think of a better science than optics manufacturers to help us out. They are 100% about observation ( no pun intended ). Hopefully they will come up with something that will allow tweeking in fudge factors.
Agreeing that uphill and downhill doping require the same logic and practice to resolve, what I read in the correct and incorrect application examples is curious.
The story is about the practice of range doping (on game twice and then on a paper target), bullets struck some 6" high using the TBR data. Yet in the Correct/Incorrect section the correct doping would result in a bullet strike 7 clicks higher than the incorrect doping. Assuming 1/4" per click @ 100yds that translates to a 7" higher bullet strike than the incorrect doping.
I'm not trying to be argumentative here, just help me out, wasn't the original problem with bullets striking 6" too high?
If I've misunderstood then my apologies to the author and I will more thoroughly re-read whatever is suggested.
All of that said, I must confess that I have never shot at game over 100 yards from anything above about 15 - 20 degrees--not enough range or elevation difference to matter. My want and dream though is to go sit on the edge of the Caprock here in Texas and pop off a few rounds to get some of the elevation and distance experience discussed in the article.
A bit of history, i live and hunt in the mountains, from 500m to 1000m height and i encountered this phenomenon too.
Firstly uphill or down the 6 inch high is correct and the calc by bigred proved it.
As i understand it, shooting at a great angle uphill the projectile is not flatbut angled up, well der!!!
so if a projectile is 20mm long but angled at 45 degrees it is only say 15mm across if you were to look straight down on it, therefore it is 25% smaller.
This wont reduce the gravity by 25% because the weight etc is the same but it will affect it.