Soooooo... is M855 attracted to magnets (steel core), whether it has a green tip or not? IS M855 in fact, a "steel core" round?

I've just tried ye olde magnet trick on some rounds I KNOW are M855, and got nothing (green & NON-green tipped). And I have this old "NPA 99" headstamped stuff, that I THOUGHT was M855 (I got it loose back around '08 - '09), and the magnet don't stick to it, either.

Here's a look, for reference:




MOST have that green shellac around the primer. I'll let wiser heads than I weigh in, on what this stuff ACTUALLY is! Thanks!