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keep it for spare housing and battery cover and lenses
my experiance and others experiance from ppl i know personally the onboartd balistic calcs work great , we dont use the wind drift part of it though just distance
when u zero ur rifle witht he one shot zero u have to do it at base magnification , i personally use a 50y zero on the grendel this gives me a 50 and 2xx zero depending on the round im shooting
for example the 90g tnts im shooting are 0 at 50/230 and 19 inches low at 400
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