It works just like the dillon does. The rotating cutter spins the shavings to the outside. On Dillon's they use a vacuum to suck them away. On mine, I put a shroud around it to keep them from flying around (they will jam stuff or they'll get your eye!) and periodically vac them out.
Because the cutter is super sharp carbide, cutting like a mill does, there is a small amount of shavings left on the case, but not enough to need to chamfer. The short answer is that with this type of system, a chamfer is simply not needed. Dillon's works the same way.
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