The front screw draws the action down and to the rear to takeup the recoil, the rear screw draws the action down to the stock further absorbing the recoil. The center screw holds the floor plate and trigger guard in place and if you tighten the center screw too much you will stress the center of the receiver. Tighten the front and rear screws equally (very tight and lube the threads with never seize) and then just snug up the center screw. You may have to play with the torque on the center screw to permit the floor plate to open.
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