gunboat:  I believe you are excessively tightening the rear action screw.  Try putting the barreled action in the stock and firmly tighten the front action screw.  The barrel should lay bottomed in its stock channel.  Then, put the barrel band on and tighten the sling swivel screw.  Lastly, install the rear action screw so it is just snug.  Do not tighten to the point that it causes the barrel to lift.  Test it out at the range.  This is the correct set-up IMHO.