When I was young and tough/ stupid I used a 14 pound M24 .300WM to hunt moose in AK. I was also poor and that's the only rifle that I had that was suitable as far as caliber. Don't know how many miles that I humped that thing through the muskeg around the Tanana river, but I won't be doing that again.
That rifle was set up with 190 grain SMKs, but I found that 180 grain Game Kings shot darn near as well, as in less than 3/4 moa, so I was quite happy. With minor adjustments I worked my dope out to 900 yards.
For the next hunt I'm now building a lightweight 6.5 PRC, using a Proof Research barrel. I have used nothing but Bartlein barrels for years, but I'm trying to hit about 7 pounds total weight. I'm using a light tactical stock and a tac scope, so operationally it will still work like what I'm used to. I should have it ready for elk this fall.