Reply To: Shooting at an angle
To do this quickly on the fly, just use the estimate for a horizontal shot. That is, drop an imaginary line from the target straight down (or up if shooting downhill) and estimate the range to that point. Your drop will be very close.
For instance, the target is at the top of a tree. The base of the tree is 25 yards away. Use your 25 yard hold and it will be close enough. You wouldn’t be able to tell the difference.
However, your wind dope will be for the actual yardage and maybe a bit more since the wind velocity is generally greater the further from the surface you get.