A friend of mine bought a new custom Ruger 10/22 with custom matched barrel and hogue stock. The whole set-up cost him $240. Its his first rifle and he decided to mount the after market scope himself (keep in mind he never did this before). He used weaver mounts and the Rifle came with the rail already installed. This is all the info I have about the rifle itself and our communication is all long distance and he has no internet access.

Now the problem:
He went to the range and at 25yds cant even get on the paper and the scope ran out of adjustment. He went home put a .025 shim under the back and tried again, the results werent much different and just barley hit the bottom of the target at 25 yds but still ran out of adjustment to move up. So my question would be; How much shim is to much shim and if its not the scope, what else could it be?

I told him to indicate the mounts to see if their the same height. I have the same scope myself and it yielded nothing but excellent results.


Thanks
CB

I'm not passing judgement on your friend, but if its his first time adjusting a scope, he may be going the wrong direction. With some scopes, moving the scope adjustment "up" will move the point of impact up. While some other brands, moving the adjustment "up", moves the crosshairs up, causing the point of impact to be low. If that's not the case, he may want to try a bore-sighter and see what happens. If he still has no luck, he probably needs to have his scope checked for problems.

I do know on the scope he's using, moving the adjustments up does move the point of impact up and he did say it was moving up but topped out way to soon.

What if a bore sighter shows the scope also needs to be rasied more? and what if another scope yielded the same results?

CB

Is it possible that he has the front and rear bases reversed? If his scope cost him over $9.99 I would suggest he has a problem with his bases.

If he trys another scope and it yields the same results then it is definately the mounting system.

Maybe it might be worth your friends time to stop in the local gun store and ask for help, lets face it we all get alittle frustrated when we can't make the rifle shoot straight. I wonder if the barrel is mounted proper ( turned all the way in). Best of luck hope it works out because at 25 yards ya should be able to point the barrel at the paper and hit it. smd

Thanks, I will suggest the above to him. That was my thought too that maybe there's a defect in the gun itself or possible something wrong with the rings. All the rings I have bought for my rifles utalize the same front, rear rings so it doesnt matter which possiton their mounted.

How much shim is to much shim?

Thanks
CB