Posted: 12/18/2015 5:23:53 PM EDT
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I inherited a nice Ruger 77/17 with the laminate stock and heavier barrel. It had a cheap scope on it (couldn't see clear) although it was sighted in at the time. For better optics I had a Zeiss Conquest in the safe and carefully mounted it up using the FAT torque wrench, lock tight, etc.
Ruger uses proprietary ring/mount and with the factory rings I couldn't even zero at 15 yards. Point of impact several inches left of point of aim with no windage adjustment remaining on scope. Upon disassembly the factory rings appeared canted and marked up my nice Zeiss.  I chalked it up to crap rings...
Ordered some Warne rings made for Ruger and thought that would save the day. However, the range trip today had the same result. Any ideas on a fix? I really like the rifle and want it to work. Very frustrating so far. That Zeiss has been on my 30-06 and no previous issues. |
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You may need to lap in the rings to get them true to one another first. If the first set was off bad enough to pinch the scope tube the new ones may be seating on the damaged section of the tube and pulling the scope off line.
I usually set a piece of ground rod in the mounts before I tighten them to align them. If you do have to lap them, and have never done it before, there are some good videos on Brownel'ls web site outlining the process. |
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I believe the new Warne rings are true and my scope tube appears fine short of some bite marks.
That said, I have to assume the receiver rail is off or the notches are not milled/cast to be centered with the bore. What to do? The little I know.... Lapping perfectly good rings is not going to do me any good. |
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Quoted:
I believe the new Warne rings are true and my scope tube appears fine short of some bite marks. That said, I have to assume the receiver rail is off or the notches are not milled/cast to be centered with the bore. What to do? The little I know.... Lapping perfectly good rings is not going to do me any good. I lap every set of rings, you would be surprised how far off a new set of any brand can be and, like cm noted, the burrs on the edges will bite a scope. In your instance you may have a faulty receiver but before sending it off I would check it with a laser in the bore. |
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Some of the rugers guns have different height rings and some have the same height. I think that all 77/XX rifles use the same height front and rear. Do you possibly have two rings that are different heights? This is what I was thinking. Have you checked the ring height with a micrometer..?? td |
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From what I remember the rings have a half moon key on the base of the ring that is not in the center from front to back. The rings will only go one way.
It is possible that there is some foreign material in that female key cut on the receiver that is shifting a ring to one side. It is also possible that there is foreign material on the fixed side of the clamp portion of one ring. I have mounted dozens of ruger rings over the years and have never found anything other than confusion about the height. The old 77 rifles had one ring higher than the other. The 77/22s and I think all MiniXX rifles use a set of rings that are exactly the same height. I have seen lots of possible combinations of screw ups. Mostly different height rings on rifles that require the same height. If you reverse the position of the rings on a rifle that uses a high and low ring, it is obvious that something's wrong. The height is way off. If you post pictures, some of the ruger fans here will probably be able to diagnose the issue. |
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Again, these are same height rings. And only one direction available. A 12x scope was almost maxed out on windage (zeroed) and my Zeiss 14x doesn't have quite enough adjustment to zero. A few inches off at 15 yards.
Not sure pictures would tell us anything... My guess is we are talking thousands of a inch off center from bore. Still out of town but plan to call Ruger soon. |