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Scope mounting issues on a BPS

Beer gut
I am trying to figure out what is wrong I mounted a Leuold 3x9x40 rifleman shotgun scope on a Browning BPS. I purchaced the browning base and had it drilled tapped and mounted at my local gun shoppe. I bought Millet rings and mounted them myself when I went to shoot the gun it shot terribly low and I ran out of upward adjustment on the scope still shooting about 14 inches low. The base can only go on 1 way and is tight, and as far as I know there is no front and back to weaver style rings. I re-leveled the scope to the base and added 4 pieces of paper shim under the scope in the rear ring. According to my bore sighter I am now right on the money and gained back a full+ turn on the elevation knob from max. I just think this is unusual, and is this the proper way to correct the problem. Oh also the barrel is a hastings and I tried 2 different types of bullets shot a nice tight group just low.
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Comments

6 comments

Date Votes
  • pitjeep
    what heigth rings did you use? you want the lowest you can use.
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  • Beer gut
    Medium and that was the lowest I could go.
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  • tsr1965
    All things that are machined, are machined to a dimension, that has tolerences. I would assume that either the base of the reciever are both on the edge of opposite tolerences, or one , or both are out of tolerence. Don't shim inside the ring. You will encounter more problems that way, when you crush your scope tube. Try putting a shim under the rear of the base. A piece of brass shim stock at about 0.015" should be about perfect.

    I might suggest you take it to a professional, before you wreck the scope, and/or the gun.

    Best
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  • MIKE WISKEY
    did you mount the scope to the receiver?. the barrel and receiver only have a 'slip fit', no real mechanical attachment. Remington has 'cantileavered' scope mounts that mount the scope to the barrel, a much better system.
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  • blacarrow
    There is a problem with the way it was drilled and tapped, with the bases, or the barrel but not the receiver, I believe.

    Prior to retirement I was the Chief Firearms Test Engineer at Browning Arms in the R&D Division. One of my assignments was the development of the BPS "Slug Gun" It was a Marketing decision to adopt a "cantilever" system where the scope mounted on the barrel. A number of early models featured a receiver monted scope system. My best groups were achieved when the scope was mounted on the receiver. 1" groups at 100 yards were common, and the best I shot was 1/2" measured center to center (3 shots). It must be noted that this was shot under ideal conditions in an indoor 100 yard tunnel.
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  • Beer gut
    Thanks guys
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