I've been using Kelbly rings, the 30mm double screw model with a Nightforce scope on a 7mm STW and a 300 Win Mag for about a year and a half now. No problems with ring strength.
Let me know what ones you get and how they work out. I looked at the others but the price was more than I could afford. I have Burris signatures on my 300 RUM for over 400 hot loads with no trouble. I like the off set bushing. I am building a new LR gun with a custom action so maybe for that gun.