You need more than two of the Weigand rings on that caliber. Because the rings are narrow and offer less contact area, Weigand recommends no less than three. Placement depends on the slots in your base, which is usually two in front, and one in the rear (some of the Weigand bases have only one slot in the rear).
I use four Weigand rings on some of my setups with two in front and two in the rear. I have a 45/70 BFR with this setup, and it has survived hundreds of 405 gr full house rounds. The object of the game is to keep the scope on the gun, and to prevent the scope tube from flexing (yes they will), which is one of the chief causes of scope failure.
Handguns recoil differently from rifles, and I suspect that was one of the reasons for the suggestion in a previous post to butt the ring against the turret housing. Many of the instructions for mounting rifle scopes tell you not to butt the ring(s) against the turret housing. It is a different ball game.
IMHO, rings are like beers, the more the better! I have five rings on my .454 Raging Bull with a 1.5 x5 Burris. Probably overkill, but it is a long scope and the RB has a long base. My hunting partners like to deride this effective setup as "Lord of the Rings", but I have had no scope failures.
