I use the burris signature zee rings on my 338 edge shooting 300gr. at 2840fps with a Nightforce 5.5-22x56 and have had no problems whatsoever. My zero has stayed the same since I first sighted in the rifle.
I have used them on 338-378 light weight rifles with sport weight scopes without a problem, but it does seem to be an issue with some of the extremely heavy military scopes that are popular. The main issues that I have seen are people mixing insert sizes on the same ring they should be the same size - and + of the same value. I do wish that they would do a better job of labeling the inserts to avoid problems. The base grooves are generally way too wide for the ring cross bolt and probably should be glassed in. The cross bolts do take a little patience and have seen them cross threaded giving the false impression that they are tight. The 1 inch rings have 2 cap screws per ring which is adequate for 1 inch tubes and the 30 mm have 4 screws per ring which is adequate for 30 mm tubes.