If it pulled a piece of the rim off it could be the ammo has the wrong pressure curve for your rifle. Most gas operated semi auto rifles like yours, the Springfield M-1A, and the M-1 Garand do not shoot well with ammunition that has powder with a slow burn rate. What happens is the pressure curve of the ammunition peaks too late, and can cause damage by cycling the gas system with too much pressure. This can cause all sorts of problems ranging from what you've experienced, all the way to bent operating rods and broken extractors. The new Hornady manual has seperate loads listed for the Springfield M-1A and the Garand because of this. These loads employ a powder with a mid range burn rate like IMR 4064, IMR 3031, or Varget. These powders allow chamber pressure to drop off before the gas port is exposed, thereby allowing the gas system to cycle without any undo force.
Springfield Armory has a list of suitable ammo they recommend for use in their M-1A rifles, and I'm sure DPMS has much the same. I would give them a call, or else shoot them an E-Mail. I'm sure they'll be glad to help. Bill T.