I suppose that the word “clip” being used to refer to a magazine must have started in earnest during the period in which the M1 Garand rifle was common issue. “Toss me another clee-up, Cletus” would have been used to apply to either a 1911 magazine or a Garand clip (or Tommy gun, M3, et al, magazine) among comrades, maybe. I still talk with the occasional W.W. II or Korean War vet who says “clip” all the time (and if they’re from Alabama it is “clee-up”, with the extra syllable, as in “She-it” or the number Foe-er”)
And so we’ve been harping on it for a while now. Some media types are starting get a whiff of a clue, but just to be safe, they’re using both terms, talking about “magazine clips” which, technically, would be devices that hold two or more magazines together. I’ve seen those for sale. Not that your average media pundit would ever understand.
Anyway; just off the top of my head, I don’t recall ever seeing an ammunition clip than hold more than ten rounds (unless you count a belt). You?
I suppose some of this misuse is intentional, just to irritate people. When you read the actuall laws, they tend to use the term magazine when they mean magazine.