Scope question??

Discussion in 'Long Gun Accessories and Optics' started by lonewolf5347, Aug 19, 2017.

Thread Status:
Not open for further replies.
  1. lonewolf5347

    lonewolf5347 Member

    Joined:
    Jul 13, 2005
    Messages:
    493
    I like to double check we're the shim goes?
    I think in the rear Base Mount.
    I set up a new set of rings and bases on my Remington mohawk 243 Cal.
    I see to be shooting about 2" low on center,scope ran out if elevation.
    I think if I am correct I need to shim the rear Base ??
    Weaver 4x4 rings medium height
    Scope Bushnell 3x9
    2 Piece base
     
  2. JackSprat

    JackSprat Member

    Joined:
    Jan 9, 2016
    Messages:
    356
    Location:
    Jackson Co. WVa
    If you are using a two piece base then I don't know why it would come with a shim..I have seen shims come with one piece bases,but on a two piece one is usually just thicker if needed..To answer the question .If you are out of adjustment range,and are hitting low then the back of your scope would need raised with the shim..Make sure one base is not thicker than the other you may need to switch them.
     
    LoonWulf likes this.
  3. RainDodger

    RainDodger Member

    Joined:
    Aug 20, 2009
    Messages:
    2,059
    Location:
    Great Northwest - Idaho!
    Let me begin by saying: I have no experience with shimming a scope, but it "seems to me" that if you have a two piece base and you shim one of the bases to raise it, the scope tube will no longer be in alignment with the opposite ring. In effect, when you tighten the rings, you will be stressing the scope tube. No?
     
    LoonWulf likes this.
  4. MistWolf

    MistWolf Member

    Joined:
    Aug 17, 2005
    Messages:
    3,803
    It's unusual for a scope to run out of adjustment. Center the windage and try it again
     
    Skylerbone and LoonWulf like this.
  5. John828

    John828 Member

    Joined:
    Apr 4, 2008
    Messages:
    1,089
    Location:
    Arkansas
    You can cut shims from a beer can and place under the rear base.
     
  6. Art Eatman

    Art Eatman Moderator In Memoriam

    Joined:
    Dec 22, 2002
    Messages:
    46,725
    Location:
    Terlingua, TX; Thomasville,GA
    Sounds like the wrong bases were selected. Or, the bases are reversed from a correct installation.

    With the adjustment maxed: To raise the point of impact, a higher rear base would be needed. To lower the point of impact, a lower rear base would be needed. (While the OP sounds like he's maxed upward with the adjustment, it's not clear to me.)

    FWIW: I have occasionally had to swap bases. The change in angle did not harm the scope in any way.
     
    LoonWulf likes this.
  7. langenc

    langenc Member

    Joined:
    Jun 22, 2006
    Messages:
    951
    Location:
    Montmorency Co, MI
    As noted try swapping front to rear and perhaps rotating both or one --180 degrees.
     
    LoonWulf likes this.
  8. 243winxb

    243winxb Member

    Joined:
    Jul 7, 2004
    Messages:
    13,284
    Location:
    Hopewell Big Woods.
    My Mohawk 243, has an extra piece for the rear , that came with the 1 pieces base.

    I still had to shim the rear , using soda can material , that is about .004" thick.

    You can shim the rear. Make sure the screws are long enough, if a lot of shim materal is used.

    Weaver rings can be swapped, front to rear. Or reversed 180 degrees to help get sighted in.


    20170819_215553.jpg
     
    lonewolf5347 and LoonWulf like this.
  9. 243winxb

    243winxb Member

    Joined:
    Jul 7, 2004
    Messages:
    13,284
    Location:
    Hopewell Big Woods.
    Last edited: Aug 20, 2017
    LoonWulf likes this.
  10. cdb1

    cdb1 Member

    Joined:
    Jan 27, 2012
    Messages:
    4,978
    Location:
    Justin, TX
    When I was mounting 20-30 scopes a week I had to shim occasionally. It does happen. For years I would only shim a one piece base because it was my understanding that shimming with two piece bases put too much stress on the scope tube.

    One day when I was on the phone with Leupold ordering supplies I asked them about it it. Their rule is that you can use up to three shims on one base of a two piece base set without stressing the scope tube, at least with their scopes. I've down it a couple of times now with no issues I'm aware of.

    If you need more elevation you shim the rear base. Seems counterintuitive to me but that's the way you do it.
     
    LoonWulf likes this.
  11. Varminterror

    Varminterror Member

    Joined:
    Jul 17, 2016
    Messages:
    11,626
    Shimming the rear will raise your POI, shimming the front drops the POI. Sounds like you need the former.

    There are tricks to aligning the rings on top of shimmed bases. I use a lapping mandrel, bedding the bases with epoxy, pulling only the front screws of each base down tight - the lapping mandrel forces the bases to tip slightly as the rings are tightened onto the bases, and the epoxy beds the angle permanently. Once everything is hard, I tighten both screws and everything is set firm.

    Of course, it's a much better option to use a one piece base, in which case, bedding works effectively the same, except you don't have to use the lapping mandrel as the alignment guide - the body of the mount itself will force the bedding angle.
     
    LoonWulf likes this.
  12. LoonWulf
    • Contributing Member

    LoonWulf Contributing Member

    Joined:
    Jul 3, 2010
    Messages:
    16,234
    Location:
    Hawaii
    I have a spare one of those one piece bases that 243winxb mentions if you want it. I use them on my Arisakas, but the most recent one had a different base already attached.
     
  13. Sav .250

    Sav .250 Member

    Joined:
    Jun 5, 2007
    Messages:
    3,845
    Location:
    Central Fla
    Pose your question on YouTube. Should be a tutorial on the subject. Audio/visual.
     
  14. lonewolf5347

    lonewolf5347 Member

    Joined:
    Jul 13, 2005
    Messages:
    493
    A company called I Ron sighter makes a 2 piece base.
    I need to move the scope back a little more for heavy Winter jacket LOP I was steching into the scope for full sight picture
    My LOP runs 13 1/2 .
     
  15. 243winxb

    243winxb Member

    Joined:
    Jul 7, 2004
    Messages:
    13,284
    Location:
    Hopewell Big Woods.
    I used a Weaver extension ring, mounted backwards, with the 1 peice base. i learned later to cut a new notch with a file , where i needed it.

    The 2 piece base may help. 20170820_140829.jpg
     
Thread Status:
Not open for further replies.
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice