Lucky day. I checked out a pawn shop and was scrounging through some unmarked plastic boxes and sourced two large primer pocket reamers, one does width and one for depth (adjustable). Also found a flash hole reamer. These vintage tools make the task much easier. The Magtech brass flash holes were too small to use the decapper pin, so the flash hole reamer makes the holes uniform and just the right size. So for the $15 investment I ramped up production, about 140 12 and 16 gauge are completed, though there are about 50 more to finish.
The vintage UMC/Remington, Winchester and Parker Bros. brass shells only require cleaning, they are much better quality than the Magtech. Interestingly the Parker "12A" brass measure 2-5/8" and all the other brands measure 2-1/2".
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