Easiest way I've used for hunters transitioning from a "standard" scope to a dial scope is to shoot a simple tall target, record the results and transfer those drops to your app, or a piece of paper, or write it on the side of the butt etc etc. First zero your rifle at whatever distance you feel comfortable with, usually 100. However this may need to be less with subs. Use a target that is about 1.5 metres tall, big sheet of paper on a pallet works great. Then either move back 50 metres or move the same target forward 50 metres and fire another 5 shot group without changing your scope. Then either move back another 50 metres or move the same target forward and shoot another 5 shot group. Rinse and repeat out to as far as you feel comfortable shooting.
After that nice little shooting session, measure each of your drops from the centre of your target to the centre of each group, and if your scopes in mil, then measure in cm. This is now your real time data, with that particular load in that particular rifle. No need for a chrono, no need for an app. Write it somewhere thats handy and durable, and use a rangefinder if you are shooting beyond what you would use a zero hold.
And then to verify you've got it right get a clean target, set it up at one of your longer recorded distances, dial your scope the appropriate number of mil you got from your tall target test, and send a couple of shots down range and you should be on the button. Mil scopes are usually very easy, the numbers are usually for 1mil, 2mil, 3mil etc. The graduations between are 1cm. If your zeroed at 100 metres and your tall target test showed that you are hitting 20cm low at 200, thats 1mil, and if youre 30cm low at 300, thats still 1mil. Easy peasy
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