My newly expanded family (wife and step son) is in the market for another slug gun to add to the arsenol. We already have a youth H&R Sidekick .50 and I also have a beretta pintail to compliment my savage slug gun. I was thinking something along the lines of a mossberg 500 with the cantilevered rifled barrel with a scope. Does anyone have any experience with these? What kind of groups can be reasonable to expect with a decent scope (leupold, nikon, weaver) and a good marksmen with these new whiz bang super slugs? (lightfields, sst's, partitians?)