Every now and then someone with an Omega makes the same claim. Apparently some were off a different line that had larger cutters. Mine slugs exactly .500 after I ran 200 passes with JB bore paste. It still hates Tripple Seven. I have not tried Pyrodex for a long time. I might be able to get a second bullet seated with Pyrodex and the Harvester sabots now. I also have to be sure the bullets are .451 not .452.