Originally Posted by
huntersjournal
To counteract the effect, always aim below the desired point when shooting upwards or downwards
In real life, the effect becomes important when the angle between the target, gun and the horizontal line across the muzzle exceeds 30 degrees.
That's pretty much all anyone needs to take out to the field with them. Also it really doesn't matter until you start reaching out to some pretty good distances.
On a 200 yard shot on a flat shooting rifle the difference is only going to be an inch or so even at a 30 degree angle which is a pretty extreme angle. (It calculates out at being a 175 yard shot instead of a 200 yard shot).
On a 400 yard shot at a 30 degree angle it is going to start making some difference as that would be the equivalent of a 350 yard shot on level ground. Maybe 5 or 6 inches on a flat shooting rifle. Again, a 30 degree angle would feel like you are almost shooting straight down and having a good angle through the vitals would be as important as anything on a shot at that extreme angle.