Anyone have any luck loading these in 308? I have tried Varget and IMR 4895 and the results are not what I envisioned. I have a couple of good groups then they open up. No consistency and velocity is right around what Berger published. I have ruled out loose mounts, rings, and have even swapped scopes. All the same. The rifle is a Remington 700 5R 20" with 1-11.25" twist. Berger recommends 1-12 twist or faster. My goal is sub MOA out to 800 yds. 168's were ok, but seemed to open up past 500. Should I try a different powder or a different bullet?