I have a fierce 28 nosler carbon fury. Using 168 gr vld Berger bullets with adg brass and h1000. I have a guy that is good at working up accurate loads and he has great numbers for this load/rifle and the barrel has been broken in well, over a hundred rounds through it. Both he and i have shot several groups at 700 yards and can hold groups to a half minute. But there always seems to be one and sometimes 2 shots that open the group to 7 or 8 inches. He is going to try upping and lowering the charge by 2 tenths of a grain. Is there anything else we should be trying? What would you do?