Mine or someones math is not jiving. For 19.6mm I get .772" rounded to 3 decimal places. Chokes @ .741 & .731 give constrictions of .031" Rt & .041" left. I would call that 3/4 & Full.
I don't believe the PSI & Finito have any reference to the chokes. As I recall finito shows it was proofed i a finished state, don't recall what the PSI is.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra