The only time I've found this to occur is when someone incorrectly adjusts the trigger which causes insufficient sear engagement. If the trigger is adjusted improperly the rifle can fire when either the bolt is closed (particularly if closed quickly) or when the safety is disengaged. Either case is a dangerous situation and should be taken to a competent gunsmith for proper adjustment. At least this has been my experience with the older 700s. Its been so long since I've owned a 700 I don't know if they changed the trigger design.