The first thing you need to do is remove the variable of stock fit and determine if the gun shoots where it should. Put the gun in a rest, aim at a mark 20 or 25 yards away, hang onto the forend, and shoot three or four times, holding on the same point. You’re shooting a group here, and the goal is to figure out where the gun shoots. If the gun doesn’t shoot where it’s aimed, try switching choke tubes. After that, if the gun still doesn’t shoot right, there’s something wrong with the barrel, so send the gun to the manufacturer and tell them it doesn’t shoot correctly.