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View Full Version : IRONS ZERO WITH DIFFERENT TARGET SIZE


gemini1
12-06-2009, 1:21 PM
If an AR, on a 6 o'clock hold, is zeroed at 50 yards using target sheets with say 6-7" diameter center/circle dot, will it stay zero if you use a smaller diameter target like say 3"? or do you need to make adjustment on your front sight?

Technical Ted
12-06-2009, 1:28 PM
You will need to make an adjustment if you are shooting at 50 yds and using a 6 o'clock hold.

When you zeroed your rifle for the 6" or 7" with a 6 o'clock hold you set it up so that the point of impact is 3" or 3 1/2" above the point of aim (Bottom of the target).

When you change the target diameter to 3", the point of impact doesn't change: it remains at 3" or 3 1/2" above the point of aim (Depending on whether you initially zeroed with a 6" or 7" diameter target).

gemini1
12-06-2009, 3:06 PM
Oh ok, thanks Ted. So in this case it would be better to re-zero using a 3" diameter target huh? (as long as its big enough to be seen at 50 yards).
I was just thinking if I can hit those little tin cans (milk) if I use the AR for plinking.

Technical Ted
12-06-2009, 3:19 PM
IMHO Point of Aim should equal Point of Impact at 50 yds. No 6 o'clock hold. This gives you a point blank range of 210 yds
Point Blank Range defined (http://www.loadammo.com/Topics/February02.htm)

gemini1
12-06-2009, 4:10 PM
Sorry Ted, I dont follow. No 6 o'clock hold? How should I aim then? and should I leave the zero I currently have (6-7" diameter)?

Note, objective is to hit a 3" diameter target at 50 yards.

Technical Ted
12-06-2009, 4:52 PM
Zero using a Center Hold (Point of Aim corresponds to Point of Impact) instead of a 6 O'clock hold. See attached.

aplinker
12-06-2009, 5:00 PM
6-O'clock holds are for match shooting at standard targets at known distances.

You should use POA=POI for any battlefield zero.

gemini1
12-07-2009, 11:56 AM
Oh I see. Okay, definitely gonna try that. Thanks guys.