When the case was lifted into the FLS die it would leave the shoulder long by .05 but because this was to be the go guage I wanted the remainder of the neck formed out to the correct shoulder so I then fitted a spent primer filled the case to half the neck height, made a tight fitting rod and used hydrolic pressure to form the full case shoulder through the top of the FLS die. I then was able to load a 123gn A Max so the start of the heel was right at the new shoulder - neck junction. The cartridge was now 2.405 OAL compared to the 2.225 for the standard case and a 10% capacity advantage
