That's a fact. Several years ago I ran some numbers on RemShoot software to determine POI for an iron sight AR-15 carbine in 25 yard increments using M193 ball ammunition. I physically shot from 25 yards to 300 yards in 25 yard increments and the POI was within 1" of what the RemShoot software calculated it would be.
Train 2 Win
A free billistic app on your phone will get you very close, but as said - verify on the range at a few distances.
A chrono will help accuracy as well.
8-1/2 years of new stuff, but still good info.
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