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.376" when loaded with the HotCores?
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Yes, the hot core sized to .357--in one or two cartridges maybe a hair over that. But the wall thickness is noticeably less on the starline wall at the untrimmed case length of 1.704 and probably accounts for "taking up the slack" of the thicker .357 bullet. I used lee's included 350L mouth expander and the tension to the bullet was not remarkable when seating it.