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Old April 17, 2013, 08:49 PM   #11
James K
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Join Date: March 17, 1999
Posts: 19,482
I think we can rule out a jammed cylinder from heat expansion, since that clears up after a few minutes of cooling.

But one possibility is a too light hammer blow, which can allow primer material to flow back into the firing pin hole in the frame and that will certainly jam the cylinder as described. Take a look at the fired primers for evidence of shearing the primer metal, and check the hammer spring to see if it has the normal strength.

Jim
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