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Scope Verticle Adjustment???

74man
I just mounted a illuminated recticle BSA scope on my M1 carbine and used a bore sighter. The problem is that I have no verticle adjustment left. I set it on center of the sighter which I believe is at 100yds. Do they make shims for the scope rings? Should I use a shim under the ring to raise the scope? If so, do I shim both front and rear scope rings? If they don't make shims, what should I make the shim out of? Shim stock? Should it be brass, aluminum, stainless steel? Any information would be appreciated. I am just looking to hit a 3 inch group at 100 yds, don't need to put three in a quarter. The rifle is just used for targets. Thanks again for information on what to do seeing as BSA scopes are a POS, but the price was right. Bob

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Comments

4 comments

Date Votes
  • I.Shute
    Don't worry about the vertical adjustment. Just shoot at paper at 25 yards and set it at the bullet hole.
    A bore sighter with a horizontal hair that's 1-1/2 inch higher than the bore will only line up with a scope that's 1-1/2 higher than the bore.
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  • Tailgunner1954
    Bore sighters are only intended to get you on paper at 25yd.
    If you do need to shim, it's approx .001 shim/inch at 100yd. Shim under the rear base to raise the bullets impact, and under the front base to lower it.
    Aluminum cans make good shim material.

    Whittemore
    Some guys like a mag full of lead, I still prefer one round to the head.
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  • D.S.COLE
    Shoot it at 100 yds and see how far off you are. if it is low and you are out of scope adj. you need to shim the rear ,if it is high ,shim the front.
    Brownells and Leupold have shims already drilled to base screw dimensions if you have bases under your rings. If your carbine uses a 1 piece mount with no base to put a shim under then it becomes more complicated. You can cut shims to fit in the bottom half of the ring within limits of the ring halves fitting together again. Leupold tech told me that 10 thousanths shim usually moves the impact an average of 10 inches at 100 yds.You can make shims out of aluminum cans,feeler gauges etc.
    Another trick I have used that sometimes works as a last resort is to turn the scope 90 degrees in the rings. twist it 90 degrees counterclockwise after loosening the screws. This makes the windage become the vertical adj. and the vertical becomes the windage. Most scopes are made to have more movement horizontally (windage) than they do vertically, this gives you more vertical adjustment.
    Let me know how you come out.
    Good luck

    <BR>
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  • 74man
    Thanks!!!! You have given me some great ideas for the verticle adjustment. Wouldn't have thought to turn the scope and make the hori adj the vert adj. Pretty smart fella's camp here. Thanks again.

    Criminals prefer Unarmed victims. NOT MEEEEEEE!!!
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