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Old May 19, 2011, 07:34 PM   #5
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Join Date: September 19, 2008
Posts: 4,678
[I just bought an old Iver Johnson 16 gauge single-shot shotgun and have no idea what the chamber length is.]
[ I would like to know if it is a 2 3/4 inch chamber just in case I needed to use one.]

Obtain a wood dowel that's will barely slide into the chamber.

Wrap the end with masking or electrician's tape (even with said end) until it's a snug sliding fit in the chamber at that end.

Slide the wrapped dowel into the chamber being measured, slowly & carefully, until it's forward motion is stopped by the chamber's forcing cone.
Do not force it as deep as you can, or you will distort the tape/shim, and thereby alter the measurement.

Mark the rear of the dowel at the rear of the barrel/chamber.

Withdraw the wrapped dowel, and measure the distance from the tip of the wrapped end to the mark - you should have the chamber length.

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