Has anyone who owns a Christensen Arms rifle had a problem with them grouping poorly? I have one that will not group consistently at all. I have tried replacing the scope, scope rings, and bullet development... I have bore scoped the barrel and everything checks out ok. I'm wondering if their carbon fiber barreling is just a gimmick. For the amount of $$$ they cost, one would think they would shoot sub 0.5 MOA all day long... Any thoughts?