You're talking about automatic weapons. The term "assault weapon" is a misnomer.
Yes, I agree, but the media, and Democrat politicians call our semi automatic rifles "assault weapons", and "assault rifles" which is totally a misnomer.
If you're speaking specifically in terms of hunting, perhaps, depending on the type of game you're hunting. Otherwise, the .223 is a great multipurpose round.
Again, I agree and have several rifles in 5.56/.223. However, the media calls the AR-15 in this caliber a "High Powered Rifle". Compared to my other rifles in .30-06, 8mm, 7.5 French, etc it is not a high powered rifle from a caliber perspective.