I don't know enough about ballistics to even feign a conversation, much less a dispute. I will, however, state my opinion on the 300.
I find it intriguing and have a number of friends that use it. It's unlikely I ever will, as that's one more caliber to maintain. Here is where my concerned opinion comes in; If I did go with the 300, I would have my mini 14 re-barreled. That way there is no possibility of mixing up magazines for the ar and having it go bang once and wish it hadn't.
Now, back to topic of this original thread. I've enjoyed reading through the last couple years of comments. It has been informative. I'm hoping to get into some camping and less of the day after day after day routine. I've wondered about this topic as I've watched many of the overlanding videos on the tube of you. Those that are armed no doubt don't talk about it on camera or their videos would get banned. lol