You could try this: using a candle, soot up the bullet on one of the PP cartridges. Place in the chamber with your finger. Carefully tilt the barrel up (it should fall out) and try to catch it without disturbing any markings on the bullet.
Can you see any engraving marks on the bullet from your lands? Compare to the photo below. Depending if you have engraving marks, and where they are, they might tell you if your chamber just might be .223 Rem (on the left) vice 5.56 (on the right).
I know you stated (above) the Mossberg barrel is stamped "5.56 NATO" -- all this test would do is maybe verify it.
- Mossberg OEM 16" M4 Profile 1x7 Melonite Barrel
From AIM's site:
New Mossberg OEM 16" .223/5.56x45 caliber barrels for AR type Rifles. These high quality M4 profile barrels feature a complete inside and out Melonite coating, 1:7 twist and M4 feed ramps.
Specifications:
-.223/5.56 Caliber [Edited to ask, "OK, which one is it?"]
-M4 Profile
-1:7 Twist Rate
-1/2x28 Muzzle Thread
-M4 Feed Ramps
-Carbine length gas hole
-.750" Gas shoulder



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