Thanks OldGuy. I did the AIPI thing before my 870 was even fired, but it still hung up 2 or 3 time in the first few boxes and another couple of times around 1,000 shells. The first couple of hudred were with a new 18.5" barrel and the rest with a used 28" vent rib.
Neither have tool marks like the ones you described, but I am not surprised that some got through with them and its not just on the Express but some wingmasters.
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