I bought a new SBE 12 gauge about 20 years ago. I had been using a Remington 11-87 3" Magnum. I suddenly couldn't hit anything. A few years ago I gave up and put my Benelli in the closet. A friend last year suggested I pattern the Benelli. I did and discovered it was shooting about 8-12 inches high and 4-6 inches to the left at 40 yards (3 1/2 inch 2 shot Federal Steel). I'm looking for instructions on what shims to use to correct this problem? I don't understand the geometry (does dropping the stock drop the POI?).
Thank you.
Tom