Relevant discussion of chambers and cones
http://parkerguns.org/forums/showthread.php?t=28515
More canned stuff
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.
The Parker Story has original factory engineering drawings, like this from Hunter Arms. No reason to guess the dimensions.
Threaded Mode