Re: What could be wrong with my technique?
If its when you pull the trigger and you already have established good natural point of aim, it has got to be something to do with body positioning. Especially since you do it without recoil.
My guess is that your hand hold is rather to tight, remeber to hold on just enough that you can control the rifle through recoil.
You hand could have an unnatural postion or stock fit is poor, causeing you to fight the gun for a good squeeze.
elbow positioning can be a problem. If your anchor points arent rock solid, your shot wont be either.
If you load up your bi-pod legs hard and have a straight on approach (body lines up with the gun, not canted with one leg up) make sure you load up both legs equally.
Some people might not feel that that much thought goes into your body position, but I do... maybe it aint worth much, but its how I shoot.