It does shoot best with the Hornady VMax ammo, that's what I've shot .5 MOA with.
I realize that is not something I can expect from a big game rifle, but it sure would be nice.
We all have our different expectations - I don't expect that out of a big game rifle - I demand it - either it's fixed or down the road it'll go.
I haven't found one that can't be fixed - sometimes it's a new barrel, trigger, bedding, stock, scope or whatever.
Just out of curiousity - have you looked at the crown on your barrel through a magnifying glass or bore scope??