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The chamber length must accommodate a fully opened shell so the chamber length will be longer than the shell you plan to use.
 

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albanygun said:
The chamber length must accommodate a fully opened shell so the chamber length will be longer than the shell you plan to use.
That would make the case that my "measurement assumption" is faulty and the chamber is designed for either 2 1/2" or 2 3/4" and why the 3" shell is a tight fit. Does anyone know the dimensional standard for .410 chambers?
 
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