The BBTI numbers using real world weapons (scroll down from the first table) differ a bit from the cut-down T/C numbers.
Also, there's this:
pax
Also, there's this:
BBTI website said:One note: in every case with the T/C Encore the length of the barrel was measured from the end of the barrel back to the breech face. This is how semi-auto pistols are measured, but revolvers are measured as the length of the barrel in front of the cylinder gap. Take this into consideration when comparing calibers using our numbers.
pax