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The ability to measure the length of the chamber before firing would allow the shooter/reloader/fire former to know the effect the chamber will have on the case when fired and the reloader that can measure the chamber before firing can adjust the die to the shell holder in the press to size case that will chamber, memory, recovery, pop back, jump back (spring back) does not lock me up.
I use the companion tool to the press, the feeler gage, bump sounds like an accident, there is nothing I do when sizing a case for a chamber that resemble an accident, action/reaction, If I move the shoulder back the case diameter increases, so? I move the shoulder back with case body support, and, time is a factor.
F. Guffey
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