Base/Ring screw torque mounting scope

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I'm getting ready to put a new Weaver Grand Slam scope on my new Howa Varmint rifle. I've never put a scope on a rifle before. The two part bases and rings are Leupold standard bases and standard high rings. They both come with torx screws and a torx wrench the size and shape of a small allen wrench. The directions say to make the screws tight but not so tight as to strip the threads. They imply the base screws should be tighter than the ring screws. The Leupold web site says the screws should be as tight as you can make them and, specifically, the base screws should be "extremely" tight.

Obviously, I want my screws tight. How tight is tight? All the references are subjective. Can anyone give me an objective measure of how tightly the base and ring screws should be torqued? I'd just as soon not ruin the hardware I've purchased by overtightening.

Any help would be appreciated.
 
My way is to watch or feel when the wrench flexs a little, stop. Go and do this a couple of times, its good idea to use some purple lock-tight on the screws.
 
Purple Lock-tite

Kurt: Thanks for the input. The directions suggest I put high grade gun oil on the base screws. They recommend against lock-tite. (Something to do with their wonderful torx screws.) Frankly, that sounds a little odd to me. Watching the wrench for a little flex sound reasonable. I have some blue lock-tite. Do you think that would work?
 
Blue will work, its a little stronger than the purple, and some harder to remove, O be sure the screws don't bottom out before the base is tight.
 
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