At the range yesterday my buddy found many 30-06 cases with a knurled ring 1/2" above the base. It looked to be plated steel. I told him that was done to prevent reloading the "brass". I did see several Golden Bear boxes it the trash. Did I tell my buddy a lie , is their another reason for the canelure? Ive seen it on 7.62 x54 in the past.