[AnAmericanMother]

I wouldn't expect this to be a reloader. (They are, by and large, happy people who ain't mad with nobody. :-D ) Seriously, reloading is an extension of the hobby of sport shooters and varminters, not Islamicists or stone cold killers. It takes a lot of time and dedication (and investment in equipment) to get good at it. My guess is that these are standard milspec .223 rounds from some surplus dealer or other, bought by the case. It's fairly common for surplus .223 rounds to "tumble" and that would produce a large exit wound. That's another reason to discount custom loads here . . .

[Robert_Paulson2]

"It's fairly common for surplus .223 rounds to "tumble""

and that is as good an explanation as any I have heard thus far. of course, sales at MOST stores would be sort of traceable.

[El Gato]

It's fairly common for surplus .223 rounds to "tumble" and that would produce a large exit wound

As designed. The 7.62X39 and 5.45X39 do that too. If you can't use expanding bullets, which you can't by treaty, (IIRC one the US never ratified, but which we observe anyway) then you want the round to "yaw" (a better term than tumble, sinc the distance for the bullet to yaw 180 degrees is about clear through the target, perhaps a bit less), so as to make as large a wound channel and to stop as quickly as possible (OK within limits) so as to transfer maximum energy and momentum to the target.