That 300 will get ya there too, my concern would then be with angled shots on elk with the Berger like ELD's, it is of course nowhere near as tough as the 300 gr AB, I'd have to take the 340, temp drop differences would probably be negligible, don't think I could hold the difference prone over a pack or off my elbows.
I'd hate to leave a big bull in the woods for a shot not taken because of angle, you may have the luxury of hunting many days, a traveling flat-lander like me on a 3-5 day hunt has to take any available shot.
