Been my experience just the opposite . . . .
Tighten the FRONT screw as tight as I can . . . Using ONLY a large, correctly fitted screwdriver BY MY HAND ONLY! (no extra wrenches or any other tools applied to the driver shank.)
Tighten the rear with much less force, but enough to get me through a match or session at the range.
With Mausers with the thumb cut in the left wall, one can bend the receiver with too much pressure on the rear screw, so perfect bedding against the stock is imperative!