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Posted: 11/2/2011 5:31:17 PM EDT
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Ar-15 flat top reciever. Has a nikon m305 scope mount and a mid grade x14 scope. I laser boresighted in the rifle at 25 yards, moved out to 50 yards and put it on target and sht a nice tight groop. I then moved back to 100 yards and shot about four inches high. Ok, I started to ,ake the adjustment on the scope, but after six clicks I was at the bottom of being able to adjust the scope. I was still high and could not adjust the scope. What's the deal, bad scope? Any help would be great.
Thanks, Peter |
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Quoted:
I will see if I can get a picture tonight. The Nikon scope mount m233 is a one piece mount for picatini rails. It has a built in MOA of 20. Could that be my culprit? Yes . Unless you are shooting out beyound 300-400yds, you don't need the 20 MOA. 20 MOA is 20" at 100yds. You won't see a 20" drop until you get to 300 yds +/- depending on velocity and bullet weight. |
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I can't help you with your scope reticle not having any movement left in it, but if I'm understanding you correctly a 25 yard zero SHOULD be several inches high at 100 yards. That's how it gets back on target at 250 to 300 yards. At 100 yards a 25 yard zero is on its way up in its curve.
A 50 yard zero may work better for you, but it will also be a little high at 100 yards just not by as much. |
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Quoted: I can't help you with your scope reticle not having any movement left in it, but if I'm understanding you correctly a 25 yard zero SHOULD be several inches high at 100 yards. That's how it gets back on target at 250 to 300 yards. At 100 yards a 25 yard zero is on its way up in its curve. A 50 yard zero may work better for you, but it will also be a little high at 100 yards just not by as much. This^ Might want to read this. |
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Yes. Your 20 MOA base is the culprit. Don't need a 20 MOA base on an AR. That's something you would put on a precision rifle to reach out past 1000 yards with a 308.
A 25 yard zero, with optics and your AR should be roughly a 300 yard zero. We teach all this stuff at Appleseed. If you get a chance, get to one near you. http://www.appleseedinfo.org -David Edgewood, NM |
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Quoted:
Here's a comparison of the different zero's: http://i1200.photobucket.com/albums/bb324/Snake_driver/25-50-100ydzerocomparisons.jpg Parameters? Velocity, bullet weight, sight height, elevation? -David |
I stole it out of the thread about zeroing mentioned above. I believe they were using standard factory 5.56 M193 & M855 ammo though with a standard AR and A2 sights.
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