Murphy, I believe that right barrel is essentially what I would call Cylinder (no constriction), and results in pretty wide or open pattern.

The left barrel produced a more tight pattern when I shot it on paper. I am not certain how to measure\determine accurately the choke (i.e. was it full, i\m, mod, i\c, etc..)

I originally shot it at paper from 25 yards to pattern and make assessment using box of 8 shot.