I wouldn’t know the difference.
But a poster coming onto this site claiming that the EMS guy knew about guns and saw 5.56 casings all over the place - which means he also had to see the ammo that hadn’t been shot- would indicate he knew they were 5.56
If 5.56 closely looks like .223 then why say 5.56 when it has been disclosed it was a .223 gun.
What was the agenda with the FR poster???
Or now is there something lurking that the casings were really .223 and now the poster has to backpeddle.
The whole thing is weird.
I’m not trying to get into this discussion per se but isn’t the 5.56 NATO basically interchangeable with the .223 Remington?
If so then there could have been only one or both at the site depending upon what Lanza’s mother had purchased.
“saw 5.56 casings all over the place - which means he also had to see the ammo that hadn’t been shot”
I wouldn’t draw that conclusion. Two people could see the same casings laying around, and one could describe them as .223s and another as 5.56s. For the casual observer, it would probably just depend on which one they are more familiar with. It’s kind of like how an American might say someone was 6 feet tall, while a European would say the same person was 2 meters tall.