[ARCHIVED THREAD] - 500 zero and 200 zero

Posted: 1/5/2009 11:58:05 AM EDT

I had an oppertunity to get some dope for my M1A fri. at range and something odd came up. My 500 yard zero is 2 moa left of my 100, 200, and 300 yard zeros. I kow that the twist on the bullet will cuase it to yaw left or right down range but I was under the impression that it was not noticable till after about 8 or 9 hundred yards. The shooting was done with open sights and not off a bench or bi-pod so the possibility of a loose nut behind the trigger is possible but unlikely as I shot multiple ten round groups to verify the data.

Posted: 1/5/2009 1:00:54 PM EDT

[#1]

Wind?

Posted: 1/5/2009 1:22:58 PM EDT

[#2]

Both wind and light effects your windage zero.

The sun to your left or right will give you a difference windage zero compared to different times of the day.

The sun hitting the left or right of your front sight makes you see it differently.

Posted: 1/5/2009 1:35:50 PM EDT

[#3]

Maybe wind. Wouldn't be surprised if the aperture insn't tracking exactly straight up and down.

Posted: 1/5/2009 4:40:49 PM EDT

[#4]

In addition to what Mythbuster posted, mistakes are magnified at greater ranges. It's entirly possible you're doing something that doesn't show up at 200, but does at 500.

[ARCHIVED THREAD] - 500 zero and 200 zero

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[ARCHIVED THREAD] - 500 zero and 200 zero

[ARCHIVED THREAD] - 500 zero and 200 zero