I don't know much about it either, but from what I understand, the bedding it what the barrel and action sets in. If your gun was glass bedded or piller bedded for the full length of the stock, supposedly, the barrel and action will never shift the way it sets in the stock. I don't think that it makes any difference to the average hunter, but for target shooting, you don't want to not be bedded solidly. Usually when someone beds their rifle, they free float the barrel as well, not that I have a clue what that means, I was guessing that it means it's not screwed down, the bedding holds it instead, but I could be wrong.