The 156 berger with 76.6 of retumbo is working well for me,the increased bc makes up for the bullet weight at long range ,shooting 1/2 moa at 300 yds if i do my part. I left my turret set on the gun 612bc,3309 fps,3000 ft from the 140 bergers and 800 yds seems to be right on or at least the dead coyote at 820 thought so. . incidently i was running 78.3 of retumbo behind the 140 grain bergers. I boron nitride all bullets. 26 inch brux on stiller action from long range hunters