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Nikon M223 mount... Sighting in questions

Discussion in 'Gear & Accessories' started by skidoo j, Jun 2, 2012.

  1. skidoo j

    skidoo j Southern Oregon Member

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    About a year ago I purchased a Nikon M-223 scope mount and a 3-12x42 sf scope.

    I have sighted it in at 100 yards with the turret on 100 yards and it shoots well. I recently took aim at 400 yards. I turned the turret to the 400 yard hash and was about 2-3' low. turned it back to 100 yards, took aim at 100 yards and dead center.

    This scope is designed for 55gr .223 ammo at ... fps the ammo i was shooting and sighted to, matched said specifics. The scope has the Nikoplex reticle...


    So my questions:
    did all the m-223 mounts when they first came out have the 20moa in the mount and nikon has just relabeled it m223-xr?

    Am I supposed to be sighting the rifle differently at 100 yards if the mount has the 20moa? (again i put the cross hair on center at 100 and sighted then popped the turret free and snapped it on the 100 hash and have not popped it free since.)
     
  2. bman940

    bman940 N. Texas New Member

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    Skid, When the M-223 AR Mount first came out they all had 20MOA built into them. Then folks started asking for a mount without the 20 MOA so now we have 2 M-223 AR Mounts. One with (M-223 XR) and one without (M-223). As for your shooting and being 2-3 feet low, a huge difference obviously. While that Nikoplex reticle is built around .223/55 grain polymer tipped bullet at 3240 fps. Some shorter barrel AR's are producing less MV. My 16 in barrel averages 3040 fps. That being said I have still shot it to 600 yards and been able to hit a 10 inch steel gong at that distance.
    I have seen guys put this mount on backwards many times, alaways first question I ask, left handers seem to be more likely to do this....
    I would suggest going back to 100 yards, shot 3 shots, turn turret to 200 yards, shoot 3 shots, the impact whould be 2.76 inches high, turn to 300 and the impact should be 11.2 inches high. This will give you a good idea if your calibration on scope and your rifle/ammo are functioning as designed. Please keep me posted on progress Skid.

    bbk940@verizon.net
     
  3. skidoo j

    skidoo j Southern Oregon Member

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    I have the overhang to the rear of the gun. So it looks like the scope is allowed to go further back.

    So with the 20moa mount I don't sight it differently?
     
  4. skidoo j

    skidoo j Southern Oregon Member

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    That's dumb in their nomenclature The new one should have been M-223 FL or M-223-LV rather than changing the name of their old and then giving the old name to a new product. I spent almost an hour reading through their web sight trying to find reference stating M-223 of this age ... It's not like it's a computer and models change weekly, to me it would be like ford changing the name of the Mustang Saleen to Stallion and then renaming the Mustang (Base Model) to Saleen.
     
  5. speedtriple

    speedtriple Vancouver, Washington, United States Member

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    The reason for a 20 MOA mount is for long distance shooting. You sight them in just the same as a level or 0 MOA mount. But it you are shooting long distance, the 20 MOA mount will leave your scope more more vertical adjustment to allow for bullet drop at 600 + yards.
     
  6. bman940

    bman940 N. Texas New Member

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    There should be no difference in the way you sight in your rifle with the 20 MOA base or a flat base. Like I said earlier, try the bullet drop test to see if your bleeding MV from somewhere. It's just strange you are 2-3 feet off. I look forward to hearing what your results are Skid.