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I've gone through two and three or four aluminum collets (three part do-hickey that hold the brass) . They warp or implode. Get you an RCBS collet puller. Just be sure to get collet for calibers you want to pull. The collets may take a little spreading so that bullets don't stick, but you'd be surprised how much faster and cleaner it is vs the kinetic stuff, and yes I have beat the hell out of mine too and on concrete.
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