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9/22/2017 12:11:25 AM
Posted: 9/2/2005 6:09:54 PM EDT
[Last Edit: 9/2/2005 6:13:08 PM EDT by AtlantaFireman]
While calculating several loads using QuickLoad and QuickTarget, I noticed that for all loads 55-75 grains, the point-of-aim (POA) and point-of-impact (POI) at 25 yards (25-27 yards, give or take, per the program) was the same POA and POI at 300 yards. The way I interpret this: sight-in POA and POI at 25 yards, and the shooter will be very close to POA and POI at 300 yards. I could be wrong. I'll give this a try the next time I am out at the range.
Link Posted: 9/3/2005 8:59:08 AM EDT
For 25 yard AR15 shooting use the Col. Chuck Santose "Improved Battle Sight Zero" method.
You would be if you didn't.
groups.msn.com/TheMarylandAR15ShootersSite/improvedbattlesightzero.msnw

Plenty of other zeroing methods here:
groups.msn.com/TheMarylandAR15ShootersSite/zeroingmethods.msnw
Link Posted: 9/3/2005 9:26:57 AM EDT

Originally Posted By AtlantaFireman:
While calculating several loads using QuickLoad and QuickTarget, I noticed that for all loads 55-75 grains, the point-of-aim (POA) and point-of-impact (POI) at 25 yards (25-27 yards, give or take, per the program) was the same POA and POI at 300 yards. The way I interpret this: sight-in POA and POI at 25 yards, and the shooter will be very close to POA and POI at 300 yards. I could be wrong. I'll give this a try the next time I am out at the range.

Yeah, that's the basis behind the military's 30-year-old "zero at 25 meters for a 300 meter zero."

But as another said, a 50yd/200m zero is a better battlesight zero.
Link Posted: 9/3/2005 4:37:57 PM EDT
[Last Edit: 9/3/2005 4:39:01 PM EDT by Bartholomew_Roberts]
Take a look at that trajectory and see how high you are at 100m with that zero. It is a significant number 9" or so IIRC. Which probably explains why the IBZ is more popular - flatter trajectory and you can still use the range adjustments for longer shooting.
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