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P220
11-28-2011, 5:35 PM
No experience about sight-in a firearm, only have iron sights, and PMC .223 55gr. ammo.
I think I usually shoot the target within 300yards, maybe I should go to ASR,
Aim the dead center, and first zero at 60 or 70 yards, and then confirm at 200yards? So if the target in 30--200yards, I just aim the dead center. If <25 yards, I just hold over a bit, and when the target >230yards, I should hold over more and more.

Or I need zero at 50/220yards? Please give me some suggestion!

My Iron Sight:
http://www.bravocompanyusa.com/v/vspfiles/photos/LMT%20Rear%20Sight%20L8A-2.jpg

rdmax
11-28-2011, 6:00 PM
Check this site out:

http://ar15zeroing.com/

gemini1
11-28-2011, 6:36 PM
What type of rear sight do you have? if you got one without an elevation adjustment, just go for the 50 yard zero.

ebencikiv
11-28-2011, 7:02 PM
http://www.calguns.net/calgunforum/showthread.php?t=424586

BBB114
11-28-2011, 7:13 PM
I zero all my rifles and teach my students to zero at 100 yds. Start at 25 yds which puts your point of impact 1.5 inches low from the point of aim. Then try it at 50 yds which will put you 3/4 inch low. This will get you a zero at 100 yds, point of aim point of impact. I use Winchester Q3131, but the pmc 55gr is very similar so results should be the same.

With a 100 yd zero, body shots out to 200 yds will remain in the "10" ring of a standard silhouette target. At 200 you will be about 2 in low. Still well within acceptable limits. The only thing you have to remember, on headshots at under 20 yds, hold at the hairline to get a vital shot.

I prefer this method to the military zeros.

Boyan

P220
11-28-2011, 10:43 PM
I zero all my rifles and teach my students to zero at 100 yds. Start at 25 yds which puts your point of impact 1.5 inches low from the point of aim. Then try it at 50 yds which will put you 3/4 inch low. This will get you a zero at 100 yds, point of aim point of impact. I use Winchester ...

Thanks a lot guys! I have checked gunwebsite's PDF here:
http://gunwebsites.net/wp-content/uploads/2011/09/Guns-AR15-Zero-Introduction.pdf

I find 200yds zero seems good, and easy to aim when I shoot within 250yds.
When I zero at 50yds, can I aim the center of bullseye, but maintain the POI a bit lower, like this,
to achieve a good 200yds zero? So the POI will be in -2/+2inch from 25yds to 240yds.
http://sphotos.ak.fbcdn.net/hphotos-ak-snc3/hs447.snc3/25659_1431387269718_1383972614_31199602_2585300_n. jpg

P220
11-28-2011, 10:45 PM
200 yds Zero, Bullet Flight Trajectory
http://www.calguns.net/calgunforum/attachment.php?attachmentid=124542&d=1322549131