I finally got to the range today and shot this rifle. The attached photo shows the results. The barrels are shooting 6" apart at 50 yards and the left is about 3.5" higher than the right. The group from the right barrel, as you see is fabulous. The left is all over the place. When I got home I decided to check the crown on the left barrel and sure enough it had several bad burrs in it. I've honed those away and hopefully this cures the problem. I used my new regulating jig to bring the muzzles together by .006" and raise the right barrel by .003" relative to the left. Next shooting, probably Friday, will show the results of this.