I use the signatures on my .338 Win mag. Model 700. It's not a heavy rifle and it does kick. I also shoot 225 Gr. bullets. Never had a problem with the rings slipping. I also use them in my 375 H&H shooting 270 Gr. TSX. Again no slippage. If you're still having problems give Burris a call. A different set of inserts might solve the problem.
I will give them a call. After my first round of slippage I swapped the scope for a lighter Leupold in a 1" set of the same. No issues. Except the scope wouldn't hold zero after a dozen rounds. Need to send that in too.
