Chuck,
The tension screw will most likely address both problems at once. POI shifts, as well as erratic groups. The screw tension will allow you to "tune" the barrel, and if you use more than a 1/4 to 1/2 turn of tension, your forend will be mostly free floated on it's own, as you'll be pushing the forend away from the barrel. When I do my next No.1, my plan is to drill & tap a hanger screw, and then shoot the rifle with the forearm "free floated" using the rubber washer trick. After that, I'll glass bed the forearm to the hanger, to where I have a close, but free floating forearm. I don't care for the huge gap between the barrel and forearm that a couple of turns of the screw creates. Just a personal preference thing.
Jeff
