I have NEVER EVER EVER tightened the rings down on a scope tube to a specific torque.

I only use the Burris Extreme Tactical with 6 screws.

S-L-O-W-L-Y tighten the centers screws on each side of the scope ring in 1/2 to 1 full turns alternating side to side.

I actually do the front and rear rings at the same time. 1/2 turn on the middle front screws, 1/2 turn on the middle back screws, then back to the front and on and on. Takes awhile, but no issues with any of the scopes I have mounted.

Once I am sure the rings have enough bite on the scope I will catch the other 4 screws up to the center ones.

Make sure you keep the gap between the scope ring halves as equal as possible.

Don't forget a dab of Loctite Blue 242 on the screw threads.