308 needs a bigger receiver than 223/556. 6.5 Grendel would fit a 223 action though, and would be my choice for a hunting round given the action size restrictions, but you'd need a 7.62x39 bolt for that I do believe?
down south, they are making 50bmg bolt action upper receiver for the AR-15, it shouldn't be a problem to fit the same on the WK-180 lower. Now, 6.5 Grendel requires a larger bolt face, thus would require a complete BCG along with the upper. Thus what I suggested 300BLK.




















































