you can also setup a target at say 300 yards zero the rifle at 100 and chrono the load then measure the POI vs POA then use your strelok to reverse engineer the BC.
Ie. rifle zero'd @ 100yd @xyz ft/sec with .xxx bc= drop @ 300
just keep changing the bc till it matches up then verify by stretching it to 400-500. fine tune if needed remember to find the centerline of the verticle dispertion of the group don't worry about what the wind is doing.
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