The news media are acutely ignorant on this subject. In our local weekly paper there was an article a few years ago about a man who murdered his brother with “762-millimeter rifle”(about the size of the Krupp railway gun). The reporter, who is an acquaintance of mine, just kind of shrugged when I explained the error. Since the U.S. has been in Afghanistan and Iraq I see this kind of ignorance almost daily in the media.
But that was a single shot weapon. Are you sure he didn't mean the 76.2mm assault rifle?
(Tried to find a picture I once saw of an Oto Melara Super-Rapid test firing - 3 or 4 shell casings ejected from the turret, still in the air.)
That would do it.
A big part of the problem is the post-modern irrationalism that is taught nowadays. Mere facts do not matter, so a news reporter may not be bothered at all if he discovers that he mis-reported something. Facts are taken to be merely meaningless social constructs that get in the way of the real truth — the real truth being your feelings.
Don't forget, these are the same people who question whether or not the troops should have a certain kind of body armour, or whether Aegis is a viable defense system, or whether a "surge" in Iraq makes sense.