I use the free version of Strelok for my drops when out target shooting. It works for me, but I also know the BC of the bullets I am using and chrono speeds.
The online hornady one is good as well and the numbers I get are the same from both.
Whatever one you use keep in mind that not all work "offline", I dont have cell reception where I target shoot so the Hornady one wouldnt work for me while shooting.
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