I find my Omega likes 348gr. Powerbelts or 300gr. SSTs or almost anybody else sabot with bullets of around 300gr. I Elk hunt so I have not tried any lower weight bullets. I also only shoot 100gr. or less of most of the synthetics; I shoot 90gr. or less of 777. Am presently doing a comparison of Clean Shot (American Pioneer), Black Mag3, and 777. Check Graybeard site if you are interested. I expect to have results by next Thursday.