Then how do they know it's a .223? there are a dozen or more centerfire .22's rounds that can fire the same bullet as the .223. If they have a recovered bullet or some fragments they could determine if it's a military .223 or the Russian .22 caliber military round, but if it's a commercial .22 bullet it could have come from any one of many different .22 centerfires.
Could it just possibly be that the MD cops are playing up the .223 angle for the purpose of further frightening the sheeple about evil black rifles? MD government is very anti-gun, so I wouldn't put it past them.
Pretty sure they've got solid ballistic evidence for .223
Then how do they know it's a .223?
I was wondering that myself. The BATF spokesman from the Baltimore field office, Mike B...., on TV was just asked if they recovered and brass and he said he would not comment on what was recovered from the shooting sites, just that they have recovered some good evidence.
BINGO! That's the first thing I thought when I heard about a .223 being used. It's amazing how they decided it was a .223 without a piece of brass.