Interesting thread.

I suspect that the degree of deviation from horizontal at which one is shooting, is MUCH more significant that significant than an exact knowledge of the range. To understand this, we all have to go back to our school-days (remember cosines?) Of course, those of us shooting slower bullets may need to consider this more than those with blood and thunder, light speed calibres.

But of course, getting the adjustment for shooting up or downhill, is an ADDITIONAL concern, not an ALTERNATIVE concern. If we get the range wrong by a bit, and the adjustment for inclination wrong by a bit, and they are both wrong in the same direction - then, we have a possible aggregate POI discrepancy that might prove to be significant.

I don't have a rangefinder at the present, but I'm thinking of ordering one - if only for an additional thrill of retail therapy.