Please excuse my ignorance, but what is the difference in power between a .223 AR and a 5.56? I know that most ARs are 5.56 and can therefore also shoot .223, but I have seen rifles that are just .223. Maybe a better question is, what's the maximum load you can use in a .223? I'm just curious.
Also, I currently have two ARs that are 5.56, but I've been thinking about getting a higher powered AR for longer distances and/or large game. To be honest, I'm much less interested in being able to shoot longer distances, than in having a higher powered rifle for larger game, like large black bears/grizzlies, etc. I had thought about getting a 300 blackout, but now I'm not so sure. Would this ammo be powerful enough and how difficult is it to find? I've also thought about a .308, 6.5 or 6.8. What would you guys get?