I think most of you are underestimating the weight of slings and ammo
Perhaps, but I don't guess when it comes to weights... but I wonder whether a couple of the posters here are not backpack hunters, but dayhike hunters?
Uncle Mikes Mountain Sling weigh's 3.5 oz's.
4 rounds of .308 Win w/165 weigh's 3.5 oz's.