Tight Chambers

[bamboozler]

When reading about Foxes (usually those Foxes designed for waterfowling) the term "tight chambers" is often mentioned. What's the definition of "tight chambers"? Did Fox offer dimensionally different sized chambers?

[TEJ]

perhaps "tight chokes" might be more accurate if speaking of long range duck guns? Forcing cones may be another consideration...either way, chambers, in my limited knowledge, are a length, not tight or loose?

[Researcher]

Nope. It is "tight chambers." See this chart from Ithaca Gun Co., the nominal diameter of the 12-gauge chamber at the mouth (B) is .798" for a 2 3/4 inch or .7968" for a 3-inch chamber.



The mouth of most unmolested Super-Fox chambers is .788" in order to be sure the cartridge is held in the chamber perfectly concentric with the bore. That is why the metal machinist ruler is a better way to measure Fox chamber depth then a nominal industry gauge.

[bamboozler]

Thank you for the explanation and info Researcher.

[FoxintheHenHouse]

I found out about "tight chambers" on my Chicopee Falls, Mass 20 gauge Sterlingworth. The chambers stop a blade type choke gauge dead on at 2 1/2", but it has 2 3/4" chambers when measured with a steel ruler.

FoxintheHenHouse