I have mostly found with most calibers I have owned that at 25 yards your bullet will be 5-10 mm low and that will put you a bit high at 100yards. Once you are on target you need to fine tune at 100 yards about 1.5" high (give or take a bit either way ) for a 200yard zero. The 25 yard shot is a good way to confirm you zero at longer range as once you have zeroed for the longer range come back to 25 yards and fire a couple of shots and remember where they impact then you can do a quick check if need be.
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