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12-Gauge using .730 inch as Standard bore l.D.
CHOKE DESIGNATION -------- I.D. -------- CONSTRICTION
Cylinder -------- .730 -------- .000
Skeet-1 -------- .725 -------- .005
Improved-Cylinder -------- .720 -------- .010
Skeet-2 -------- .715 -------- .015
Modified -------- .710 -------- .020
Improved-Modified -------- .705 -------- .025
Maximum-Modified -------- .700 -------- .030
Full -------- .695 -------- .035
Xtra-Full -------- .690 -------- .040
Maximum-Full -------- .635 -------- .045
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