Chamber length?

[Nicholas Sarro]

So what you're saying is that even an unfired shell measuring 2 5/8' is too long for a 2 5/8" chamber? How much of the shell is used in the crimping?

[OH Osthaus]

Originally Posted by Nicholas Sarro

So what you're saying is that even an unfired shell measuring 2 5/8' is too long for a 2 5/8" chamber? How much of the shell is used in the crimping?

no- he is saying-for example - an unfired 2 3/4 12 gauge shell will fit in a 2 5/8 chamber.

the crimped portion of the shell has to fit within the chamber when it has been fired - otherwise it opens into the forcing cone and there can be pressure implications

a 2 5/8 shell is 2 5/8 AFTER firing (or brand new before being loaded the first time)

[Steve Havener]

Originally Posted by Nicholas Sarro

So what you're saying is that even an unfired shell measuring 2 5/8' is too long for a 2 5/8" chamber? How much of the shell is used in the crimping?

Not necessarily. Parker routinely cut their chambers 1/8th inch short to achieve a better gas seal for the fiber wads used in period ammunition so a chamber that measures 2 3/4 inches would be appropriate for use with 2 7/8th inch shells.

[Researcher]

Not necessarily. Parker routinely cut their chambers 1/8th inch short to achieve a better gas seal for the fiber wads used in period ammunition so a chamber that measures 2 3/4 inches would be appropriate for use with 2 7/8th inch shells.

That is true for guns chambered for paper shells. Guns chambered for the B brass shells should have a chamber exactly the length of the brass shell.