I make 8x57 Mauser blanks from 30-06 cases. I use once fired military brass to reduce costs. The crimped in primers were a problem until this tool. As Mr. Peterson said don't run it in too deep. About two turns and the crimp is removed without altering the rest of the primer pocket plus it leaves a nice chamfer to aid in insertion of the new primer.
All I can say is "NICE" the cutters are very sharp and remove the crimp easily and the bonus is that you get both small and large cutters with this kit, The Knurled handle makes it easy to hold and turn, it will take about 2-3 turns to remove the crimp and your case is ready.
A great cheap (price, not quality), functional tool for reaming out those pesky military crimped primer pockets. One word of caution: do NOT bottom out the tool in the primer pocket! It will be too large.
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