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How hard is your lead? Several of my .44's measure .444-.443, 3/8inch in to the cylinder and I have no trouble seating both .451 and .454 with Colt, Uberti, Pietta, and Pedersoli manufacture.
What are the odds of getting two under sized cylinders? Maybe a hangup in the loading ram?? Do you know anyone with a loading stand you could try?
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