I guess mine proably has different harmonics than yours as most do it seems no two are ever quite the same;
mine is more sensitive to powder load than which bullet, with most bullets I get good groups with from 90 to 110 or 120 gr RS[230XTP, 250 SW,XTP,Gold Dot,300gr SW,XTP,Gold Dot; the exception to this is the 200gr 40 cal bullet with the blue sabot both the XTP and the SW shoot groups that average one inch or less with 150 gr RS or pellets
Mine will shoot the Sabortooth and the PB's with excellant accuracy with 150gr but I dont use them, I just dont think their design is right for the heavy loads that my Omega likes all though from what experimenting I have done the Sabortooth just might work. Lee