It is a specialty round for special circumstances created by legal definitions.
In other words, it might be perfect for your needs in southern MI.
It is fine for deer hunting, even black bears.
The rebated case head (smaller than the case body) makes it simple for rifle actions ordinarily chambered for the .223.
On simple mechanics, I am not a rebated case fan.
It looked like it wouldn’t lend itself to reloading very well.
Seating on the case mouth is a dumb idea.