I recently purchased 3000 rounds of mixed brand once fired 9mm brass. I am currently processing the brass with a RCBS Trim-mate power unit. I have noticed that when reaming the primer pockets of the S & B brass, the pockets seem to be undersized and are extremely difficult to ream as opposed to all the other brands. They can actually seize up on the reamer and I am unable to hold them or remove them with fingers. Then I have to stop the power unit and carefully use a pliers to remove them. Has anyone experienced this problem?