Ok, so I took the time and slugged the bore of my Encore 209x50 endeavor barrel. I came up with a land diameter of .500 and a groove diameter of .509. Right now I'm using Harvester black smooth and black crush rib sabots. They both measure .500 at the base on average. Is there another kind of sabot that would give maybe a tighter fit or am I already on the right track? And, is this a normal measurement for one of these barrels?