Searching THR for the topics the OP has posted about probably won't return much, because it's either exotic vaporware, or like this thread, one of the oldest gun debates out there.
Dropping 5.56 vs 7.62 into google returns
117,000 results, a lifetime of reading the same firmly entrenched camps opinions reiterated. In this particular case, I just don't think a fresh debate over caliber was going to be productive, especially considering the OP doesn't have
anything new to add. It's just tossing a scrap of meat out to be wrestled over.
I apologize if it sounds harsh. I didn't mean to suggest the OP not ask questions, I do think he needs to focus his research a bit better to build his knowledge base. I can't be the only one that drops a question into Google to survey what kind of information is available on a topic. Hell, doing so with
specific questions has brought me HERE on enough occasions that I decided to lurk, then join, then lurk some more, then contribute where I can.
Of course all this is meaningless, as I'm sure someone will start a 9mm vs. 45acp thread before the day is out.
I'll stay out of that one.