A glass bedding kit from Brownell's only costs about $11. Now if you already have a dremel tool and a few hours worth of time the ability to follow directions and a few days for the bedding to cure you have very little to loose by glass bedding a rifle. The upside is that it will make your rifle more accurate the only downside is that it might not do anything at all but it will never hurt.
Not in my experience if a gun doesn't need a glass bedding it doesn't need a glass bedding. I have 2 rifles that went from pretty good shooters to horrible shooters because they were glass bedded and they were done by Gunsmiths. Barrels were free floated as part of the procedure and the accuracy went to hell.