The problem with bedding the lug tight is that it doesn't have a natural 'relaxed' position to return to after the gun fires...it's always fighting against the bedding to go where it naturally wants to be.
The second issue is removing/replacing a tight lug in the bedding invariably shaves fine pieces of the bedding off. These get into the lug mortise which further works against what bedding the lug is trying to achieve. -Al
