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Rifle shooting five feet low!

Discussion in 'Rifle Country' started by WhiteKnight, Nov 5, 2009.

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  1. WhiteKnight

    WhiteKnight Member

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    Guys,

    I tried to sight in a new .308 rifle tonight. I had an IOR 20moa base, Badger rings, and a Bushnell Elite 4200 4-12x40AO. I completely ran out of elevation adjustment, and my rifle still shot approximately five feet low at 100 yards. Is the base hurting me? I have it installed like the guy below (with the 20moa wedge to the rear) of the rifle.

    [​IMG]

    http://www.bushnell.com/products/scopes/riflescopes/elite4200/424164SF/
     
  2. jmr40

    jmr40 Member

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    Just a SWAG, but could the base be mounted backwards. I'm not familiar with this type of mounting system
     
  3. GregGry

    GregGry Member

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    are you positive the scope is good?
     
  4. Horsemany

    Horsemany Member

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    Are you sure you've adjusted the scope the proper direction? Sounds like the base is correct with the thicker portion in the rear toward the shooter. At 100yds you should actually be a little high with a 20MOA base and an optically centered scope.
     
  5. dmazur

    dmazur Member

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    In order for POI to be 5 feet below POA, your scope has to be limited out in UP adjustment. With a 20MOA base, your POI at 100yds is going to be above the POA, so you should be adjusting DOWN to move POI closer to POA...

    At least, that's how it sounds to me.

    So, the question is, which end of elevation limit have you reached, UP or DOWN?
     
  6. lobo9er

    lobo9er Member

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    spin the scope 25 degrees clock wise i did that once but man 5 feet holy smokes
     
  7. Walkalong

    Walkalong Moderator

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    That's what I am thinking, assuming the scope is OK. If anything, it should shoot high at 100 yards before you adjust anything when using that base .
     
  8. johnmcl

    johnmcl Member

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    Hi all,

    Wedge to the back for tapered bases.
     
  9. WhiteKnight

    WhiteKnight Member

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    I am completely out of "up" adjustment (as in "I keep needing to go up but can't click up any more"). I adjusted it completely down just for kicks -- I was then shooting 30 FEET below the target instead of 5 feet below it.
     
  10. Walkalong

    Walkalong Moderator

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    I am not real familiar with them, but I though only the 1000 yard shooters used those tapered bases.
     
  11. kanook

    kanook Member

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    Try the redneck boresighter.

    Set the rifle on a bench,

    pull the bolt out,

    line up your rifle at about 50 yards looking thru your barrel at your target at what looks like center,

    now look thru your scope and see how far off you are.

    This is not perfect but will get you on paper till you get your boresighter from the store.
     
  12. WhiteKnight

    WhiteKnight Member

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    Please note: I seem to be pretty much dead-on as far as left-right adjustment; I am simply shooting five feet lower than where I'm aiming even after completely using up my "up" adjustment.
     
  13. MGD 45

    MGD 45 Member

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    This is exacty how I start the sight in process for any bolt gun I put a scope on. However, I start it at 25 yards with a small bullseye target.....fire a shot, adjust, move to 50 yards...repeat again then go to 100.
     
  14. USSR

    USSR Member

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    WhiteKnight,

    A couple of checks: 1. the taller portion of the picatinny rail is to the rear. 2. The scope is mounted with the turrets at the top and to the right (don't laugh, a buddy mounted his scope with the elevation on the left and the windage on top). Using a 20MOA rail causes your rifle to shoot higher, not lower. Lastly, the scope you have chosen is not a good one for use at 1k with a .308, since it has very little W&E adjustment built into it.

    Don
     
  15. browningguy

    browningguy Member

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    I think the 4200 should work fine at 1000 yards with the 20 moa base. I haven't bothered to do the math on this one but I suspect it has enough elevation built in with the base under it.
     
  16. Brazos

    Brazos Member

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    I bought a brand new CZ 527 a few years ago that was about 3'-4' low at 100 yards after adjusting the scope all the way up. Turns out the rifle came from the factory with a bent barrel. I need to send it back but haven't because I shimmed the scope (a bunch) and got it to point of aim at 100 and it is extremely accurate. I still need to send it back because it does bother me. I talked to CZ on the phone about it and they said no problem send it to them. The point of this is that things like this happen time to time so don't rule it out.
     
  17. chevyforlife21

    chevyforlife21 Member

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    that base does look huge...
     
  18. USSR

    USSR Member

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    I cannot find a Bushnell Elite 4200 4-12x40AO listed on Bushnell's website, so I am assuming he meant the 3200 model. If so, it only has 50 inches of built in elevation. Assuming with a standard base he could zero at 100 yards with 25" up and 25" down available to him, a 20MOA base would only net him 45" of total up available to him. Depending upon his load, he could be at the extreme edge of his elevation adjustment, which is not a good place to be, since it limits available windage adjustment. I stand by my statement that Bushnell scopes with their limited W&E adjustment are not a good scope for a .308 rifle for 1,000 yard shooting. If you are shooting a flatter shooting cartridge, then fine.

    Don
     
  19. sprice

    sprice Member

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    Just aim higher! (sorry, I just had to make a smart-ass comment) ;)
     
  20. Sport45

    Sport45 Member

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    Are your rings both the same height? Just wondering if you have a matched pair or just a couple pulled out of a drawer. If the front ring is taller than the back it would cause this as well as possibly bending the scope.
     
  21. wyohome

    wyohome Member

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    Just aim higher! (sorry, I just had to make a smart-ass comment)
    Or put more powder in your cases.
     
  22. Horsemany

    Horsemany Member

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    I hope this is an exaggeration. Scopes don't have 25' of elevation @ 100yds. Do you have another set of mounts to try?
     
  23. janobles14

    janobles14 Member

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    sounds like the round to me. i have a load for a .30-06 that is only 1 grain of 4350 less and shoots almost 2.5 ft lower. barrel harmonics dont play! i would try a different round. one of the gurus may correct me but i have found that in this situation you need to use a hotter load to stabilize.
     
  24. Afy

    Afy Member

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    I had a problem with running out of left adjustment. Bad rings was my issue.
     
  25. R.W.Dale

    R.W.Dale Member

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    A distinct possibility!

    Swapping the scope rings front to rear is a good way to see if this variable can be ruled out
     
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