How do you stop your scope from sliding foreword?

Today I took my new toy out to the range (Remington 700P in 338 LM w/ Millett LRS w/ Millett rings) and was in the process of testing some loads and after the first testing the first load (a light one at that) I noticed my scope had moved forward. So I tightened the rings as tight as I dared and after a dozen rounds or so I noticed it had move again. Any help would be great.

Thanks,
Justin
some options:
1)lapping
2)loctite
3) proper tourque
 
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In the 25 years of installing scopes and lapping their rings, I have almost never seen one set of rings which showed complete contact surfaces on the bottom half's. This includes Leupolds, Warne's, Redfields, Millett, etc. The only exception has been Near Manufacturing in Alberta. Their products are the best.

I personally do not ever put any paper or tape on the rings. We want 90-100% contact on the bottom halfs of the rings. With the paper or tape, on the rings, and the screws tight, they will damage your scope! Once they are lapped and torqued properly they should not move.

Though on big bruisers going to Africa, I will, with approval of the customer, put lock-tite on the rings.
 
Scotch Kote available at electrical suppliers should work. Doesnt marr the scope. Can be removed with a little effort. Its the stuff you can dip wire in to and a plastic covering forms. Ross Seigfreid of Guns and Ammo came up with this years ago.
 
lapping rings

I always lapp my rings not only to make sure the scope is held tight, but the last thing I want is to put bending stress on my $2000.00 n/f. Also I use lots of leupold rings which are ok but always required lapping. My n/f rings on a n/f rail were close but not perfect thanks
 
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