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Bore sizes of the shotgun 12 guage chokes

KHILJI

Plastic
Joined
May 26, 2011
Location
pakistan
Can any one let us know the bore size of the 12 guage shotgun chokes which you are using in your shotgun or avaliable in the market I am having 2 shotguns baikal MP-153 which came with along three chokes the bore size of two chokes are 18mm and one is 17.5mm. The other shotgun i have is tomahawk it also came with three chokes the bore sizes of it chokes are 18mm, 17.5mm and 17mm can any one let us know the maximum bore to minimum bore of the chokes.
 
It is not the diameters, but how much smaller the diameter of the restriction is compared to the bore of the shotgun barrel.

Here is a very good explanation, from the Briley website:

Understanding Shotgun Chokes, A brief explanation by Briley

Here is a quick reference chart:
Shotgun Choke Yardage Shotgun Choke Restriction- difference between bore and choke
Cylinder.................< 20..................0
Skeet.......................22.5................005 of an inch
Improved Cylinder.....25...................010
Light Modified...........30...................015
Modified...................32.5................020
Improved Modified.... 35..................025
Light Full...................37.5...............030
Full...........................40 or More.....035
Extra Full...................40 or More.....040

The website I linked at the top has a very good explanation, so it would be informative for you to study it briefly.

Regards,

Mark

P.S. Welcome to the forum.
 
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