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I disagree. If you're using the 300 meter post at 25 yards for zeroing, then using the tip of the chevron or horseshoe dot for engaging targets inside 300 meters, you should be basically dead on. Not inches high....
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Use 50. It's dead nuts on (within 2") from 30 yards to about 230 yards. A 25 yard zero will have you missing high on anything smaller than beach ball on targets over the likely ranges you'll be firing at.
I disagree. If you're using the 300 meter post at 25 yards for zeroing, then using the tip of the chevron or horseshoe dot for engaging targets inside 300 meters, you should be basically dead on. Not inches high....
Running the numbers for M855 from an M4 (14.5") as the OP has now indicated he has, I get a value of 1.8" high at 300M (assuming a 25M near zero) at sea level, the higher in elevation you go the more it will be off . It's not exact, but it's less than a MOA off the point of aim at sea level (it's roughly 1 MOA high at 4500' ASL) .
Move it in to 25 yards and zero with the 300M mark and the bullet will be striking 4.4" high at sea level (over 1 MOA high).
Knowing the clicks are 1/4 MOA, one could zero at 25 yards then adjust down 6 clicks you'd be pretty close to a perfect 300m zero. You'd still need to check it on a range in case things aren't exact (like click adjustments and/or squareness of all receiver, barrel, and mount).