True M193 is a "5.56" or "military pressure" load. Commercially, it would be a +P load, assuming that SAAMI decided to make such a designation for .223 Remington; they haven't.
Examples of ammo that is "5.56":
Fed XM193 & XM855
Winchester Q3131 & Q3131A
IMI M193 & M855
South African M1Ax (where x=1 to 6)
'98 & earlier PMC
IVI (Canadian) SS-109
Examples of ammo that is commercial ".223":
- Fed American Eagle
- Winchester "white box" loads (other than the Q3131/Q3131A loads)
- Remington UMC
- IMI .223
- Black Hills (all but specific military loads, such as Mk262 Mod 1)
- Virtually all hunting ammo
- '99 & later PMC
- Russian (Wolf/Tula, Barnoul, Uly)
- Czech (Sellier & Bellot), including their "M193"
- Olympic .223
Note that being ".223" isn't automatically a BAD thing, but it is important for those who are looking for defensive/duty ammo to understand how dramatically their fragmentation range is reduced (or eliminated altogether) by dropping the MV of their ammo 150-200 fps. For non-duty use, this is no big deal, and I normally use .223 loads for practice myself, to save the 5.56 for more important stuff.
-Troy