I have not loaded the 140 Berger, but I have loaded, many 140 grain bullets including Nosler Accubonds, Nosler BTs. 140 Barnes TSX and TTSX's. I am also shooing the 168 Berger.
My favorite powder at the moment is RL-19 for the 140 grain bullets. Alliant gives the Max load of RL-19 at 63.0 grains. I have gotten good results with 62.0 grains. This load has produced 3060 ft/sec out of my Rem 700 with a 24 inch barrel. I think that RL-22 is another good choice as well as IMR-4350.
With heaver bullets(160-168 grains) I have used IMR-7828. 59.0 grains behind a 168 Berger has shot very well out of my gun.