The lugs in those guns are one of their biggest problems.
Due to the speed and force the lugs hit each other with, these guns are eating themselves from the first shot on.
I had one guy bring on in that was so worn, only one and one quarter lugs were making contact.
The lugs must be kept clean and a good gun grease on them. As was stated, save the hot loads for your bolt guns.
Do look for anything else rubbing as the action goes back.
Check those lugs carefully, you can feel the wear with your finger and observe the contact with your eyes. If badly worn, it's a wall hanger.