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Haven't used the Mec SuperSizer but my Sizemaster press has the same collet sizer as used in the SS. It will size the high brass heads back to size. I like Mec's tool to measure the sized heads. It has holes for no-go and go which makes it easier to adjust the collets. You can adjust the collet to make it squeeze more or less. The Mec tool is called the "Shell Checker". You could use calipers but the shell checker is nicer.
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