Has anyone her noticed this on your spent brass? My buddy contacted Ruger today to find out why this is happening to the brass coming from his Ruger American Ranch rifle. The Ruger rep said that he possibly had an oversized chamber. The rep suggested that my buddy send in his rifle along with a spent factory case to see if they needed to replace his barrel. Does this happen just in the Ruger bolt action rifles or does it happen in other bolt actions,single shots and in AR platforms. I ask this as I also own a Ruger American with soot on my spent factory brass and wonder if it is widespread or just a few Ruger rifles.