I was in a heated debate on another forum, wth folks who felt 223 was the way to go. When I told them I know no one using it, and how 45-70 has made a big come back, they pooped themselves and called me every name in the book.
I do get lung hand heart shots will kill anything. Lots of premium 223 ammo these days that will expand past what people were using 30 years ago. But I hunt heavy bush, where it is can be hard to track, and limited shooting.