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Posted: 1/10/2009 7:22:25 PM EDT
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Greetings,
I finally received my ACOG TA01 back from some factory warranty issues. I installed the TA51 mount and the Troy BUIS by recommendation (I'm glad I did, what a great little sight), and took it out immediately and got sighted in at 25 yards. As I moved to the 100 yard range, I realized that my projectile P.O.I. was about 4-5 inches high. I moved back and forth between the 2 distances to ensure it was not mechanical error, and started to notice the front muzzle flip of the rifle. I think this was causing the issue, but only at 100 yards. As I began compensating 4 or 5 inches low, I started getting nice little 1.5 and 2 inch groups. What is my fundamental issue? I use a tapco vert grip and shoot from the bench. Is there something in my form I am missing? Thanks in advance... |
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For .223, your best zero is at 50y.
http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143 Having said that, I think the ACOG manual states that you should use a 100y zero so the BDC lines will be accurate. So, double check that manual. |
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Quoted:
For .223, your best zero is at 50y. http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143 Having said that, I think the ACOG manual states that you should use a 100y zero so the BDC lines will be accurate. So, double check that manual. Yes the ACOG zero is 100 yards. What is painful is that nearly everyone in the Army with an ACOG is forced to zero on the 25M line....Makes the sight way the hell off at the ranges the ACOG is good for... 
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Have a great week!
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Yes the ACOG "should" be zeroed at 100 yards so the resident BDC markings will be correct, however, if you only have a 25 yard range to zero your ACOG here is what you do. Set POI 1.75" lower then POA and you will be almost dead on at 100 yards. That is with using 55 to 62 gr. 5.56 ammunition out of a 14.5" or 16" bbl.
MadDog 
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