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I have the exact same high primer issue with my 9 month old unit. I load only .40 S&W and .45 auto. The problem is more pronounced with CCI primers. I load CCI, Federal and Starline brass, all with similar results. Similar issue with large or small primers but will vary depending upon exact case and primer brand/size used.
It does not make much difference whether I place something under the punch, where the "dent" is made or not. Hornady sent me new primer punches to no avail. Comparing the upward travel of the punch during primer seating, there is plenty of travel to seat the primer much deeper, but does not. My unit is timed properly and nothing appears to be loose.
I have a large stock of CCI primers and will be switching to other types when this stock is gone, but this will not make the priming process 100%. Currently I prime on my single stage, which works perfectly no matter what.
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