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still looking for a browning specific chart
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The Hallowell chart, referenced by oneounceload, shows the same Browning star code choke markings as other references like Briley. The Citori in question doesn't have typical Browning markings.
A gun maker can chose to label his chokes in two ways: consider cylinder bore as his start (Perazzi marks cylinder bore with an O and full with a 9), or use your tightest choke as your start (Browning typical uses one star for full and three for cylinder, or, in the case of the early Citori, a number 1 instead of one star). Other makers stamp the actual diameter of the choke like 18.4 (in mm's). Traditional UK makers may mark chokes in quarters (0/4=cyl; 1/4=imp cyl; 2/4=mod; 3/4=imp mod and 4/4=full). USofA makers typically just spell out the choke markings. It you find an old Winchester with "FULL" marked on the barrel, there's no questions.