FYI the most recent issue of "Successful Hunter" ( Wolfe Publishing) has an article about Bobcat & Coyote hunting. The authors' favorite gun is the Savage .222/ 20 Ga. Combo. He uses an illuminated low-power Leupold illuminated variable, for night shooting. He does mention that of the 4 he has used, 3 needed the shotgun barrel tweeked to shoot to same point of aim as rifle barrel. He says it is easy to do, but didn't mention how.
Mark