The Hornady 4DOF calculator returns exactly the same drop for both 1000 and 2000 feet above sea level.
FWIW I get the promotion of the Applied Ballistics app, but having sat side-by-side with a user of that app, and simple old me with my working class Strelok Pro, the calculations from both apps returned to the same answer, and I hit the goat and he didn’t!
Just sayin’...
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