Ok so I decided to "ram" the round into battery. After chambering it I took the upper off and gave the BCG a good rap with a rubber mallet.
As expected the whole thing snapped into battery. I then extracted it (took several raps to the charging handle with the mallet) and examined the cartridge.
There were some markings on the bullet itself however I believe that these marks came from being stripped from the magazine. I now notice that there are obvious marks on the casing itself. I've attached a photo of the cartridge itself after I managed to extract it.
Note the markings on the rim of the case and around the shoulder of the cartridge... Is the chamber too tight? This is a Federal Brass Eagle brand .223, not 5.56.
How do I go about fixing this now?
Btw, there is no damage to the actual chamber, BCG or charging handle after this.