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I was looking at carlton choke tube chart. i see different guns have different sizes for the same name like ic-m-f . one may list a lm as the same size as another f . if this is true does that mean all mod shoot the same patern or does it mean all .725 "s shoot the same patern? if it goes by mesurement like i think it would be, then when your budy puts in a mod. tube on his browning , you may be puting in a skeet in your breata , or something like that. any idea?
 

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My experience has been that the bore guage from Mr. Bulley on this forum is a valuable tool to determine what you really DO have in the gun for a choke.
 

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Ultimately what you want to know is the amount of constriction. This is expressed as the bore diameter minus the mimimum diameter of the choke. A choke that has 0.040" of constriction (or more) is usually considered full.

The best way to determine actual performance is the dreaded pattern testing - time consumining and boring but usefull.
 

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It also has to do with bore. one gun may have tighter bore and need less constrictive choke. Like a .700 bore and .725 choke could be considered light full when a .710 bore and a .725 choke may be considered light modified. Not the best explanation or even an accurate one but hopefully it illustrates the topic.
 

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Windy,

Both of your examples are no choke constriction. The choke has to be smaller than the bore to have choke. HMB
 

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Woops. Yeah that ain't good. Ok .725 bore and .700 choke and .725 bore and .710 choke.

Thanks HMB. Never talk on the phone and type at the same time.
 

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Here is some info I posted on another thread relating to how Kolar labels their chokes. I don't think their system is substantially different from anyone else's.

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The numbers on Kolar chokes refer to the amount of constriction (in thousandths of an inch) compared to the nominal bore of the the barrel. Thus a # 20 choke on a .750 bore has a choke diameter of .730.

Kolar labels their chokes as follows:

15 - Lt. Modified

20 - Modified

25 - Improved Modified

30 - Light full

35 - Full

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Ted K.
 
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