I was wrong. (It is hard to say!) I patterned the gun at 16 yards today. I took 5 shots from the right barrel at one target and then 5 shots at another from the left. The right barrel shoots about 4 1/2" left and 2" high. The left shots 3 1/2" left and 2" high. All 5 shots for each barrel were very consistent and it was very easy to see where the gun is shooting.
When I put an extension on of about 1/2" it dropped the pattern almost perfect. The extension was just a pad that compressed to about 1/2" thick.
So I would think that I need to add about 3/8" to 1/2" to the LOP and put about 1/4" cast off on the stock. Correct?
