Wayne Shaw wrote:
Actually, I use shims of paper stacked to the proper height/thickness to get the barrel centered AND to get the action setting level in the stock. The rear screw keeps that end where it needs to be, then stack shims so the action doesn't tip forward and does not have a gap at the front. I hope I'm explaining this well enough. If you get the "stack" right, the action will not have any stress and will be supported evenly front to back. Very important to have it stress free, so when you do install the screws and bolt the gun in, there is no bending or twisting. When your screws tighten up quick like a snap, no sponginess, you know you have a good bed.
I like using drywall tape for the shims. Comes in a big roll, cheap and has a crease down the middle. Just tear off what you need.
I like the idea of the paper shims. Seems like they would be easier to deal with than the tape. I use a couple of 2.5 inch 1/4 28 bolts/screws with the heads removed to locate the action when setting the barreled action into the glass.