Just purchased a 12FV in .223. I am toying with the idea of having it immediately shipped out for a new barrel. Havind said that, if the factory barrel can hold sub-moa accuracy, maybe I'll just shoot that one out? Having never owned a .223 bolt-gun, I am not sure of how long that would be. I want to shoot heavier bullets (69gr & up) and safely load as hot as I can... What sort of round count should I expect?