Understanding Choke Constriction

[Mollyontherun]

It appears that Carlson and Brileys use a different method of numbering to measure choke constriction.

For Example, a modified choke:

Carlson Modified .6oo

Briley Modified .016

How do I compare "apples to apples" in figuring out these two different numbers.

Thanks,

MONTR

[Mountaineer]

I assume you are dealing with a 20 gauge...if so, the .600 would be the bore size at the choke constriction while the .015 is the difference from the bore before the choke segment to the tightest portion of the choke, ie. the choke's constriction.

Neither is a given for modified...only an indication.
Constrictions vary some by gauge as well.
Patterning is the only sure way to tell what a particular choke will deliver with a particualr load.
Still, for a general guideline it is close enough.

[Mollyontherun]

Your explanation got me all the info I needed to figure it out.

I'll pattern my new chokes early next month.

Thanks,

Jon

[Ryman Gun Dog]

MOTR,
This is why in a prior thread on the 28 board we talked about different weapons manufactureres, using non standard measurements when they produced their weapons.
In reality there is no way to compare the the guns. What you will need to do is actually pattern the gun with different shells to find out which shell repetatively works best,
some guns were not built to what we consider the American standard measurement, this is why I keep stressing that the purchaser must be educated enough to understand what he or she is actually buying.
RGD/Dave