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I use strelock. It allows you to put in the elevation, barometric pressure and temperature for "sight in". Then when going hunting I can put in the current altitude, barometric pressure, and temp and the drop is calculated accordingly, there is a toggle under zeroing weather labeled "zeroing weather. Enabled" that you have to make sure is "on". I would assume most decent calculators have this ability.
Then it's best to check how accurate it is calculating the drop vs. reality. I set up a couple of my modern rifles without a chrono and just adjusted the velocity in the calculator until the drop it showed matched what I was actually seeing on target.
Even only shooting at 1000', if you get the calculator matching your actual results on target you then should be fine to move to 7000' and input the new altitude and weather data into your calculator. You could even check it when you get to hunting camp, simply put in the new altitude and weather data, see where it says you'll hit at 100 yards, and then shoot and see if it is correct.
One thing I like about Strelok, is that you can set your zero at a certain altitude, say 1000', then after all the data is completed, you can change the altitude and it will give you the change.
I will admit I haven't used it since using the custom.
There's two suggestions of Strelok. You can down load it FREE from the Google store or from apple right to your phone.
Strelok is a free, whereas Strelok Pro is about $12. The Pro version has just about every reticle, so its easy to pick yours from the list.
Applied Ballistics is rated #1, but its not free and costs around $30.