I am just about done setting up my son's Mossberg 500 and I have a few questions on the choke. I bought it and the deal included a .555 pure gold choke. I have hevi 6, hevi 7 and HW 7 to pattern in it. I have a burris speed dot scope on it as well. Anyone care to share what kind of patterns they have gotten from a pure gold in their mossbergs? Can I expect better patterns with this .555 or should I be looking for a .570 or possibly a different choke? If a different choke is recommended, which one? Thanks.