The trigger is the first step. You just do that because it needs to be done. Next, make sure that you go through and do a proper Barrel Break in. Just google barrel break in, or look through these forums as I have seen the procedure in here as well. I suggest free floating the barrel if it isn't already. That affects the barrel harmonics, or the way the barrel vibrates and flexes everytime you shoot. It the barrel is touching nothing, the thought is the harmonics will always be the same. If the barrel is touching, each time you fire, and the barrel flexes some, maybe shifts a bazillionth of an inch, the next shot, the harmonics wil be different. As for the glass bedding. I have never done it to any of my rifles, and all of them, with the exception of my AR have shot 1/2 groups.