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Joined: Jan 2006
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Sidelock
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Sidelock
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There is an easy way to measure chamber length using a 3" x 5" index card, rolled lengthwise, and slid into the chamber. It will partially unroll and expand to the chamber diameter. Gently advance the card until it stops at the end of the chamber (where the forcing cone constriction starts), use a pencil to mark the card at the breech end of the barrel, and repeat the steps to see if it always comes to same spot. Then use a ruler to measure the length marked on the card.
The chamber must be clean, and it works best with a new 3” X 5” card.

But this works too; Cerrosafe chamber and forcing cone casting courtesy of Marcus Merritt



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Sidelock
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Sidelock

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I may have a Starrett bore gauge in the correct range also. Or I can turn down an aluminum rod on the Lathe and check the depth that way. Thanks for getting to think a bit. I was just looking for an excuse to breakout the torch I guess.

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Sidelock
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Sidelock

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Well Drew....you inspired me. Behold the Truth stick...aka the Drew Stick.

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Sidelock
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Sidelock

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It's trunned to an OD of 0.795. I pulled out the vintage Remington model 10 from somewhere about 1910 (early serial number gun) Rim sits above chamber end of barrel. so I measured and added 0.060" (average rim thickness of some shells I measured). Total chamber depth is 2.770" I was surprised to say the least.

The Drew stick inserted

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Sidelock
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Sidelock

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Patented marking device applied to said Drew Stick

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Sidelock

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Measurements of Old Paper Super X and a new Super X shell.

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Show off wink
Here 'ya go
David Williamson has machined a complete set of chamber length gauges and might contribute his dimensions



The entrance to the chambers of c. 1900 12g U.S. doubles is usually .809” -.812”, tapering to .795” - .798”.

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A 1908 Remington Repeating Shotgun (pre-Model 10) catalog page; "chambered for 2 3/4" shells"


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Sidelock
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Sidelock

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Gun made it. It’s as described by the seller. Looks like all original metal with a stock repair and Re-finish on the wood. Nice and tight.

Measured the chamber length on this 1912 FOX BE. What do you guys think they measure?

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Sidelock

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