It looks like it has a design flaw, where does the swarf go? I bet after ten or twenty cases bits of swarf fall back down the neck hole as you are "chambering" brass into the sleeve, if filings jammed against the brass shoulder or body then your brass would protrude less towards the cutter and end up at a longer trimmed length.
I could be wrong but it looks to have very little space to hold the "trimmings"
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