I have always tried out lighter bullets in any 338 cal I ever had, even for elk/Plains Game. I used the 210XBT in a 340W in Africa. A 180NAB in a 338 RUM on aoudad and the old Barnes 185XLC in 338WM on cow elk. I'm looking at this "new to me" Mod 77 338WM and I'm thinking of playing with the lighter bullets first. I always get around to Heavies, ha. Anyone have experience with these two bullets in a 338WM and could you share your results, i.e. range/wound/load? Thanks!