Loc-Tite is readily available at local hardware stores, and there are other products like it. Good advice from jhjimbo; the red Loc-Tite is more aggressive. Apply the Loc-Tite to the screw threads, torque them down securely, as usual, the Loc-Tite will dry in the absence of air. I use it, and I recommend it.

DakotaMan,
Have you tried using a liner inside of the rings? I just bought a pair of Sako rings that come with a rubber or vinyl liner. I'm sure another big name ring/base maker uses them but the name escapes me. They prevent your rings from marring the finish of the scope and supposedly grip the scope a little better. I haven't shot with them yet but the concept is promising.

I use loc-tite on all my scope mounts and it works well and I always use the blue loc-tite.

With a properly ground screwdriver a a small machinist's hammer (3 or 4 oz) and no loc-tite is needed.
Simply torque the screw as tightly as possible by hand. With the the screwdriver firmly and squarely mounted in the screw slot, apply "tightening" pressure on the screwdriver while gently but firmly tapping "down" in the screwdriver. The screws may be removed in the same manner by applying pressure with the screwdriver and gently tapping the screwdriver.
I've mounted scopes on .340 Wby & .375 H&H in this manner with no problem.
About 3 or 4 taps will suffice to tighten a screw, whatever is necessary for removal.
Just remember, it's a screw, not an anvil.

Or, if you prefer, Loc-tite. I have seen "Loc-tite" screws shoot loose.

Hi...

Loc-Tite can not only be found in hardware stores, but is also a common item found in auto supply stores.

It also has many other uses than just on scopes, too.

Loc-Tite can be found just about everywhere. Hardware stores to Wal-Mart, so you shouldn't have a problem finding it. But I have never used it on a scope mount, nor the nail polish. I have never needed it nor have had any screws come loose. I guess I've been lucky.

I used to use it when refletching arrow veins but I find that Quickfletch is much simpler and gives great performance, but I digress.

I have heard that bowstring wax when applied to screw threads will prevent rust and the screws from backing out. I have done this to my bow setup and so far so good. May be another option.

I wouldn't use locktight unless the rings and bases were aluminum. But then I wouldn't have anything aluminum on my guns anyway.

I use loc-tite on all my scope mounts and it works well and I always use the blue loc-tite.

When i put my 6x24 burris on my Remington 700, i needed to shim the scope a little. Burris makes rings that have split ring inserts of several different thicknesses. You can use one thickness on bottom and another on top to achieve what you want and any combination fits into the steel rings. Works great and the reason i mention it is because the insert also is marr proof and gives some friction grip in the scope. Also, if your alignment is slightly off the inserts can move slightly to center everything perfectly. The have been on a few years and so far work perfect.