1. Ignore the supposed velocity on the box, its wildly optimistic
2. Either set up A1 or A2 sized targets at 300m, 350m, 400m and 450m and see how much they are dropping from a 200m zero
Or get/borrow a chronograph, find out what speed you are shooting at, enter in details such as the speed, BC of bullet, altitude, scope height above bore, etc into an online drop chart (plenty around, google them) and it will give you a rough idea, although I would still recommend the step above to confirm.
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