Choke constriction is measured from the bore diameter IMMEDIATELY before the shot enters the constriction and at the smallest diameter of the constriction. Parallels and divergents are not considered in measuring constriction. 0.729 at constriction entry and 0.700 at the smallest diameter of the constriction is a 0.029 constriction.
As I read your description, for the right, the gage read 0.718 from a full 12" insertion to the muzzle; that would be a cyl constriction. For the left, the gage read from 0.719 to 0.710 for 0.009 constriction; a IC constrictiion.
