I haven't found RL19 to be terribly bad, I shoot year round when I am home, usually in the high 90's or better in Va and the 30's in the Winter. Haven't found it affected my drop much at all, although, I only shoot them out to 600. I imagine it could be much worse if I was really trying to shoot long. Chronoing the loads from Winter to Summer doesn't have much more than 25-50FPS difference and much of that could be chrono set up and lighting being different from time to time as well.
BSA, that rifle is actually getting made over into a 338/375 this Fall. I am dropping it off to the smith on my way to Idaho. It has the BOSS on it and I would like just a little more out of it. Great shooting rifle and I like the 338WM alot. Can't ask for much more, but I am!! HA!
