AR Scope concern

Discussion in 'AR15/10 Rifles' started by hunterbob, Oct 20, 2013.

  1. hunterbob

    hunterbob Well-Known Member

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    I got a DPMS LR 308 and my scope height is 2.7"....
    I am not used to a scope that high off the barrel.
    Is this really a concern to worry about or should I just zero the rifle for 50 yards ???
     
  2. C.O. Shooter

    C.O. Shooter Well-Known Member

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    What type of rings? Height?

    Are you using a riser of any kind?
     

  3. hunterbob

    hunterbob Well-Known Member

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    No riser on this , a flat top.
    The scope mount came with scope.
    Mounted on rifle, Center of scope to rifle bore; Its 2.7" high
    Scope is a Kruger Tac-Driver 1.5-5x IR
    I use this this for pigs and yotes where my shots are under 150 yds..
    In ravines and dry creek beds.
     
  4. c_bass16

    c_bass16 Well-Known Member

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    With that style of shooting, the sight high should really be of no concern. It's not uncommon for an AR sight height to be upwards of 2.5 so unless you want to get a stock with adjustable comb...or a stock pack you can use to lift up your face a bit...just learn to roll with it.
    At those ranges, I don't foresee an issue.

    Is there a reason you want to zero at 50?
    I rarely make this suggestion...but you might be well off by setting up a MPBR at somewhere between 25 and 200. Your sight height won't make that impossible.
     
  5. hunterbob

    hunterbob Well-Known Member

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    Thx for the info Bass16... I figured that at 50 yards it would be zeroed at 200 also ,...
    My wife just bought me a new scope; a Nikon 3 4-16x Mil dot, the Monarch. This was after what could have been a tragic hunt, with a cheap scope blanking out when my partner depended on me, on a herd of 40+dangerous critters.... I put it on my savage 308 model 110, my long range rifle.
     
  6. Greyfox

    Greyfox Well-Known Member

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    The AR standard stock style is straight combed so the scope or open sight height is going to be generally higher, 2-3". The scope should be mounted so when the cheek is on the comb, the eye should be comfortably aligned with the scope. For longer distence shooting the higher scope height would be more sensitive to rifle cant effectiving POI. No problem zeroing for 50 yards, but most shooters would zero at 100 or 200 yards. With these zeros you would better take advantage of the bullet's trajectory. iMO.
     
  7. hunterbob

    hunterbob Well-Known Member

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    I think that's what i'm going to do. This rifle has a collapsible stock on it. and I got a pad for my cheek, that's like, maybe, a half inch thick, so when I throw up, my eye is in line every time, left or right for me. Also according to the trajectory of a .308 , 150 gr bullet; if you zero it at 50, its zeroed at 200 yds.
     
    Last edited: Oct 21, 2013
  8. ssgred

    ssgred New Member

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    I'm a little late on this one, but according to the calculator I use; with your scope height and for the sake of calculating. A velocity of 2650 and Bc of .400, your 50 yard zero would give you a 190 yard zero. Point Blank of two inches out to 225 yards.
     
  9. hunterbob

    hunterbob Well-Known Member

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    Yep, I agree on that, and went to the range yesterday and zeroed it in @ 100 yds. then i fine tuned it and have it zeroes at 200 actually , maybe just a 1/4" low..... The bullet I'm using is a Sierra 150 gr BTPP , W/47 grs. Varget, and I believe its sailing just above 2900 fps I cut one one of my bullet holes at 200 yrds. with this.
     
  10. ssgred

    ssgred New Member

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    Wow that's screaming fast! At 2790 I was flattening out my primers.I guess your chamber is a little bit tighter than mine. I have the LR 308C which is chambered in 7.62 NATO so I guess I answered my own question. Anyway congrats on the acurate rifle, mine shoots sub 1/4 moa too with my handloads. Best of luck with hunting bacon.
     
  11. hunterbob

    hunterbob Well-Known Member

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    ssgred,
    I worked my loads up from minimum and couldn't get good groups with the 150 gr. below 45 grs ... I got checking the loads for it , and they listed 47 as max; as the most accurate. I was totally impressed with the load. No flat primers or high pressure signs on the brass. I don't even have tool marks on the primers.

    Every rifle is different though and the DPMS LR 308 and the Savage 110 308 that I have are fine with it. I just got off the range yesterday and zeroed both rifles for 100 yds ,,, I noticed the shots I took at the 200 yard target, were in or near the bottom of the bulls-eye.