You're preaching to the choir.
I read the title, as well as the post. It seems obvious the .308W is really what he is seeking, as it has the widest selection of factory loadings, more than the 7-08.
Can't imagine anything a 150gr .308 TSX will not do, and do it well.
Why try to duplicate the .270W you currently own? Is it a need to have similarity in dope between two rigs? Are they sharing the same optics? Looking to have the same elevation/windage data with both rigs?
