I'd pay you a special order price to make me up one with the correction factor numbers instead of the cosine numbers. You can still count up to it from the zero to determine the angle number it corralates to bacause they numbers are in 5 degree increments. Knowing this formula is the most accurate method, I'd think it would be an asset to have this ACI model available too.
I can use the angle or cosine numbers either one in Exbal. The only time I'd be using this formula is if my batteries or Palm failed me in the field, and then I'd be using the small spare calculator in the pocket with it, it wouldn't be done in my head. Back up, ya know [img]images/icons/wink.gif[/img]
Usually you'll have plenty of time to run any calculations if an animal is out at LR unaware of your presence, but the shorter you can keep the calculation time, the better.
A 1 to 1 slope, or 45 deg angle is pretty damn steep, and most shots are indeed under this angle by quite a ways, but if range is very far using the other methods, you're back in the same boat again, the other two formulas simply aren't accurate enough to use with confidence. Material (gravel and dirt) will naturally roll off at 30-40 deg, or 1 1/2 to 1 slope, depending on the amount, and type of fines in it to bind it, so 45 degrees is quite steep.
Sheep and Goat hunters enter quite another area, and LR shots can easily exceed 45 deg or more. Reminds me of a Sheep that Brian, a friend of mine got up near off the Dalton Hwy with his bow. Shot it up through the throat from directly below at 20 yards as he poked his head over the cliff, pretty near 90 deg shot! The Sheep ran around to the side down to the bench he was on and "jumped" right off the friggin cliff!! Suicidel them things can be.
Sorry for the book there guys, it was really meant to explain a couple things for the guys just getting into this stuff and try to answer some of the questions that might follow what could have been a little too unclear brief explanation.
Here's a must read for you precision angle shooters looking for that next long range 1 shot 1 kill -
Angle Shooting Technical Article - 3 Methods Evaluated