Shotgun choke designation

[PDL]

While not specificly a S&W shotgun, my 12 ga double has for muzzle diameters .700 and .680. What would be the normal discription for those sizes - modified, open, IC, full or what. Any body know?
Thanks,

 

[chuck s]

12 ga shotgun bore is 0.729". Chokes refer to the reduction from bore diameter:

Cylinder -.000"

Light Skeet -.003"

Skeet -.005"

Improved Skeet -.007"

Improved Cylinder -.010"

Light Modified -.015"

Modified -.020"

Improved Modified -.025"

Light Full -.030"

Full -.035"

Extra Full -.040"

Super Full -.050"

-- Chuck

 

[PDL]

Thanks,
Since my shotgun came home with dad at the end of WWII, they didn't have quite that many options for chokes. But using your numbers I'd say the right barrel was Mod and the left Full.

Thanks again.