Hey guys, I ran across this a couple of months ago at a local gunshop and its been on my mind. It is a neat little tool for checking cartridge concentricity, it also corrects run-out. I ran across this info on the web:
http://www.riflemagazine.com/magazine/pdf/ri58partial.pdfIf anyone has experience with this particular tool let me know what you think of it, thanks...