Elevation affects on Ballistics Calculator

[bassassassin104]

I have been using IStrelok for several years now and it has proven to be fairly reliable for me. I hunt in Oklahoma and have never messed with the elevation as a variable. 99% of my shooting is done between 900-1200 ft. I am sending my dad off on an Elk Hunt in 3 days and he is somewhat technologically challenged so I am making some laminated cheat sheets for him and the numbers That the app is giving me make no sense. We have calculated, shot, and verified 10 moa at 600 yards at our current elevation of 1,000 ft. The app says 10.5 moa at 10,000 ft. and 10.75@ 12,500. Please correct me if I am wrong, but all other factors being equal, as elevation increases, bullet drop decreases for a given distance. Not the other way around as the data the app is providing suggests. Am I backwards or is the App giving me bad data? Let me reiterate, at this time, I am only adjusting elevation in my calculator. Thank you all for whatever feedback you can provide. I love this forum and usually just lurk, read, and learn, but I want to set my dad up for success.

 

[AZShooter]

Not sure about your particular program but many have inputs for elevation and barometric pressure.



elevation/ pressure

1000 / 28.86

2000 / 27.82

3000 / 26.82

3500 / 26.33

4000 / 25.84

4500 / 25.37

5000 / 24.90

5500 / 24.44

6000 / 23.99

7000 / 23.10

7500 / 22.67

8000 / 22.23

10,000 / 20.58

 

[bassassassin104]

Thanks for the reply AZshooter. I am trying to only adjust one variable at a time here. Anyone have any explanation why the calculator is giving me what I perceive as bad data? Am I doing something wrong? Am I not factoring in some variable correctly?

 

[Laguna Freak]

So I haven't entered the data into my calculator but, my 300 WSM 180 gr bullet that was 1" high at 100 yards in S TX was 5"+ high at 100 yards just outside of Cody, WY in Sep. Elevation was below 7000 feet. Btw; calculators that fatally attempt to use elevation in place of temp and barometric pressure are a bad joke. IMO. You cannot get an accurate equation by attempting to substitute elevation for 21" of mercury. 21" of mercury at 500' is the world's most devastating hurricane but its an average blue bird day at 6500 feet.