This is a well known issue. The front hole goes into the barrel threads and the screw is often too long needing to be ground/cut down until it secures the rail as you seem to already be aware of testing. Not many rifles come with any a rail or 8/32 tapped holes and with screws. Fix it or see if savage has the right screw. As for future problems with your Savage, but if you are concerned or anxious you could always sell it and buy a green rifle.