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Since I posted my video of the Dillon Super 1050 and Mark 7 Auto Drive people have asked me what the gadget is behind the 1050. It is a Case Pro 100 Roll Sizer. Basically it returns the fired brass to factory spec's and more importantly, removes that nasty glock bulge found on range brass fired from Glocks. Rather than tell you what it does I took the following quote from their web site. You can't get this quality of resizing from the standard dies simply because of how they operate to resize the case.
We accomplished this with a simple process using a forming rail. The rail is mounted to the base casting with 2 precision shoulder bolts and a back up rail mounted to a slide. These components are made of tool steel hardened to a Rockwell of 58-60. This makes it almost impossible to wear these components out! The slide sits on top of 2 floor fillers and is backed up by 3 precision rollers to guide the slide smoothly from front to back. The handle has a pistol grip for comfort while the cases are fed into a transfer bar that shuttles the case over the dies and drops them in between in just one stroke . When the handle is maneuvered forward the cases are rolled between the dies to reduce the bulge and re profile the extractor groove and rim while another case is loaded into the transfer bar.