I am planning sometime hopefully in the not too distant future to go with an outfitter on a western wilderness horseback elk hunt and am unsure what gun I should take with me. I know that my 300 RUM and 7 Mag will be my better choices (with the right bullet of course) but they both have heavy contour barrels and could become a problem to lug around in the mountains. The outfitter said that shots over 350 yards would not be completely out of the question but 9o% of shot opportunities would be around 250 yards and closer. Also, he mentioned that some days we might not be hunting too far from the horses and then some days we may be in the mountains hunting all day and leave the horses where they were tied up earlier in the day. I have both the 300 RUM and 7 Mag set up to shoot long (800 yards with the 7 Mag and 1000+ with the 300 RUM) and still may take one of them since with my luck a nice 350" bull will probably appear standing across the canyon at 600 yards. I do have a 308 Win. that shoots the 168 grain Amaxes very well but realize that this would not be the best bullet/caliber for elk hunting. However, this gun would be much easier to tote around in the mountains since it only weighs around 8 pounds with scope. The 7 Mag with scope weighs right at 11 pounds while the 300 RUM weighs a little over 14 pounds. Anyway, is there a .308 bullet that would work well out of the .308 Win out to around 400 yards ( assuming the bullet could retain a minimum of 1500 ft. lbs. of energy and a minimum velocity of 1700 to1800 fps)? I have only hunted whitetails (with the exception of one cow elk I took in KY a few years ago with the 300 RUM) and don't want to go under-gunned. I am currently considering the 168 Barnes TTSX bullet, the 180 gr. Accubond, and the 168 grain Berger. Any and all advice would be much appreciated and I would really like to hear some real world use with the small .308 on elk. Thanks in advance for your help!