Before you bother regulating the barrels you may just want to shoot some 50 yard groups with several different kinds of slugs to see how well they group.
I have had several over the years. The one I have now is a 60's vintage DL in .22 Mag/20 ga. Not only are the two barrels not even close, the 20 ga barrel with slugs is a "pattern" not a "group" maker at 50 yards...and that is with about 5 different brands.
So I don't even both with slugs for this gun...just Winchester .22 Magnum 40 gr. HPs, #4 buckshot and a variety of #4, #6 and #7 1/2 birdshot...
Bob
