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When I was active duty, we always zeroed on a reduced size target at 25 meters as POA/POI is coincident at 25 and 300 meters. In between 25 and 300, you may hit a bit high on a human sized target but should still hit. For close HD uses which will generally be less than 25 meters you will still hit COM or still make COM on a head shot. Maybe it is just habit, but I still zero at 25. In actual use, at ~50 meters which is about the distance I shoot most pigs, that zero seems to be pretty much where I aim, I hit.