Martin: In a 'normal' centerfire rifle, the scope experiences around 9 g's in that first instant of recoil. In other words, the scope at that point 'weighs' 9 times more than it actually does on a scale. In your example, a big azzed 375 Ultra Mag, it was probably quite a bit more than that.
A local hunter with a 338 Ultra peeled the rear scope ring loose from the base...it was a standard Leupold/Redfield style. I advised him to get a set of Talley LW one piecers and have them bedded to the reciever. No problems since then.
That big stuff can be brutal on stuff, can't it? -Al