30-06 and above, the rear ringmount will want to slide forward no matter how hard you torque those screws.
That was not my experience.
My first T3 was a 270 WSM. I began with the supplied rings to mount a 3x9x42 Kahles. I used it with those for about a year with no issues. I probably shot 200 rounds with those rings, with my load being a 130 TSX or Sierra at 3300.
After reading of others problems with the stock rings, I bought Burris bases and used Signature rings with it. At that time Leupold did not make T3 bases. That set-up worked good, but popular opinion got me to try some Talley lightweights. I didn't care for the gloss appearance of the Talleys and they were a little high, so I took them off and remounted the Burris set up.
After a rotator cuff surgery the 270 wsm and I parted ways and a couple of 6.5x55's T3's took it's place. I went with Warnes for the blued T3 to hold a 2.5x10x42 IOR and started with stock rings again for the stainless/walnut T3 for the VXII with dots. A set of Warnes popped up in the classifieds and the stock rings came off the stainless/walnut T3 and the Warnes took their place. One ring base screw gave up and I had to cut that lower mount section off to clear the way for the Warne.
I'm sure RickyD would concur.
Not really. They are solid and worked fine for me. YMMV.