From people like Martin Fackler. I knew a SEAL who thought that 9x19mm only slowed guys down while .45ACP killed in a single shot. He had far more direct experience than me, and it didn't make him any less wrong. those are two different points - I have seen some of MF's writtings, and they make a lot of sense, but I have also seen a whole stack of bodies that have been hit with 5.56 ammo - and the fact is that the bullets do react in the way that you called an "internet myth". as to the difference between .45 and 9mm - I think that most americans are obsessed with caliber size. I would much rather put 3 rounds of 9 mm in somebody than a single .45 round.