The question arises largely due to poor shooting with my Grulla SxS last Fall chasing roosters in Montana. My host and friend, who has forgotten more about dbl. guns than I will ever know, suggested I do the "16 yd test." Pattern the gun at exactly 16 yds, and bend the stock 1/16" the direction you need to move the pattern for every inch the pattern is off.Thus a pattern two inches right of center would be 2/16 or 1/8 bend to the left. Doing this 16 yd test, the left barrel was 2" rt., and the right barrel was a whopping 5" right (center of pattern). Pattern was the same whether aimed like a rifle at the patterning board, or point and shoot. FWIW, I am right handed, left eye dominant, and use a dot on my shooting glasses. Supposedly the 16 yd. test is for gunfit only, not convergence. Also FWIW, my right eye aligns perfectly over the rib.
