Taken from Burris web page...

Scopes - rifle scopes, handgun scopes, hunting scopes by Burris Optics

Q. How do I know how much to tighten my rings and bases?
A. Use the following specifications to correctly tighten your rings and bases. Be careful not to over tighten as doing so can damage your product.

Eliminator / LRFP Base Clamps: 40 inch-pounds
Signature / Zee Ring Tops: 20 inch-pounds
Signature / Zee Base Screws: 30 inch-pounds
Rear Windage Base Screws: 40 inch-pounds
AR-P.E.P.R. /Tactical Ring Tops: 20 inch-pounds
AR-P.E.P.R. /Tactical Ring Crossbolt: 65 inch-pounds
Signature Ring Clamps: 30 inch-pounds
Rimfire / Airgun Rings: 20 inch-pounds