Since you have some experience I will skip the normal things. One of the things that a lot of people get taken on is when the gun looks mint inside and out but won't shoot decent. Ends up going to a gun smith and getting the barrel shortened by about 2 inches before it will shoot good again. What is wrong? One of two things Ramrod wear the person did not use a bore protector or a gouge in the button, either will be a big problem. The most common hard to spot scope problem is that the scope has been knocked over while on the gun and had the barrel of the scope slightly bent, the excessive parallax is the only way to tell this. Lee