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Rifle Scope problem

44caliberkid
I'm fairly new to scoped rifles, but I obtained a 7x57 Mauser sporter very cheap, that has no iron sights, but was drilled and tapped for scope base. I installed a Weaver Grand Slam base and medium rings. The base is windage adjustable. I put on a cheap Bushnell 3x9 that I took off another rifle (it worked fine on that weapon). The first thing I noticed was the base is higher in the back, making the mount and scope slope downhill, back to front. I was worried I'd have trouble with it shooting very low. Just the opposite.
My first shots were 14 inches high. After I'd completely bottomed out the up/down adjustment. I'm still 4-5 inches high.
It was also shooting to the right. Now I have the adjustment to the left maxed out and it's still 3 inches to the right.
Question 1 - Which way do I adjust the windage on the base to bring the POI to the left. The adjustment is on the rear of the base, so instinct would tell me to move it right.
Question 2 - What am I gonna do about elevation?
Question 3 - What and how much do I loosen up (rings, base, etc.) while I'm making the windage adjustment?
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Comments

7 comments

Date Votes
  • chumchum
    If you can get a bore sighter. Center all the adjustments on the scope. Use the windage on the base to center it with the bore sighter and shim the base for your elevation and center with a bore sighter. once that is done when you shoot the gun in, then use the scope adjustment to get it right on.,
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  • 44caliberkid
    Do I shim the rear of the base to bring the POI down?
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  • Tailgunner1954
    Make sure you have the correct bases, and that they are in the correct location (front and rear may be reversed). Also check to see if the rings themselves might be reversed front to rear. To lower the impact point (with the scope adjustments centered) you raise the front, raise the rear to raise the impact.

    For Windage, you move the rear of the scope left to bring the impact right, and move it to the right to move the bullet to the left.
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  • 44caliberkid
    Thank you. I figured this myself by diagraming the rifles condition, a straight line representing the bore axis, and another the scopes field of view. The scope pointing downward makes the field of view lower, so when you raise the rifle to get the cross hairs on the target, you raise the bore centerline, making it shoot high. To move the POI to the left, you'd move the rear of the scope to the left. The field of view would be further to the right and you'd have to bring the muzzle back left to compensate.
    The instructions for the base said it might require some gunsmithing to the rifle to get it to fit right. I guess I figured since the holes were drilled and tapped, it was ready to go. Wrong. The raised portion on top of the action for inserting stripper clips, is what makes the rear of the mount too high. I can remove some of that, then radius the bottom of the rear of the base so it sits down level. Should solve my problem.
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  • Tailgunner1954
    Or pick up a base tha's designed to accomadate the "charger hump".
    It's often easier to modify the base itself, by removing enough material to just clear the hump. If you foul it up, a new base is a lot cheaper than a new receiver (and no one wants a receiver that looks like "Bubba" worked on it)
    When a smith does it, he removes the hump by surface grinding it to match the profile of the rear receiver ring.
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  • nononsense
    44caliberkid,

    Please do not attempt to cobble up either the rifle or the mount.

    This is a simple case of having the wrong base for the rifle. You need the M98 base. This is designed for use with the military version of the 98 with the raised notch guide for stripper clips. Here is an example:

    http://www.midwayusa.com/viewProduct/?productNumber=699012

    There are several manufacturers of these bases, just make sure you get the one that accommodates the charger hump.

    If you need help, post again and I'll check the available bases on another list.

    Best.
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  • sandwarrior
    What kind of rifle is the "sporter"? That would help us tell you exactly what kind of bases to get. There is a difference between small ring and large ring and 93/95 Mausers.

    Leupold and Redfield both make a one piece base for Mausers but not the Weaver style rings. It sounds like you may have Leupold style bases? A turn in on the front and adjustable windages on the back? Two large slotted screw heads?

    If you do have to shim I'm assuming you would have to shim under the front base. You may be able to just bed that and it might raise it enough. From your description you would need to raise it .015" or so to get it to naturally zero. I would do as chumchum said and center the elevation and windage before you shim.

    Edit:

    As nn noted above, you sound like you have a large ring front base instead of the small ring front base.
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