First thing I would do? Bore scope your barrel and see how dirty it is. My 6 CM speeds up with the increased pressure from about 3080 to 3150. Seems to happen right around every 250-300ish rounds and then requires a decent cleaning. My buddies Savage with the factory barrel was even worse, 100-150 round cleaning interval, and his velocity would spike from 3020 to 3140 and he would blow primers. Not sure about your rifle, but the Berger Hybrids dont need to be that close to the lands to shoot well. I run the 105 and 109 Bergers 20 thou off the lands, but Ive seen guys run 60 thou off with no issues. Sometimes being too close will give you pressure signs.
Myself? Im 3080fps with a 109 Hybrid, 41.2gr of H4350, Peterson brass, 20 thou off the lands, CCI BR4 primer from a 22" Rock Creek 7 twist. No pressure signs, but when the barrel gets dirty the velocity spikes, I see heavily flattened primers and accuracy goes out the window.
