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The chokes are interchangable, but Briley recommends sending your barrel to make the the choke is made to your exact specs. If you took your tube and put it in another gun, the tube may screw in slightly differently (farther/not as far) and therefore change the POI.
 

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Charles, The eccentric choke tubes would be identical to the chokes that
are presently in your gun now. The only change would be to the interior
dimensions of the eccentric choke tube. They could only be used in the
barrel that they have been indexed to, however, the indexing can be easily
changed with a flat diamond hone. I have been there and done that.

X-factor
 

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I could not find any information about deliberate changed POI on the Briley web site. Makes me question the procedure. Warranty?

X factor...the amount removed to index each gun would be no more than the width of a choke tube thread, probably? Unless too much taken of the first time. Then do it again. Swipe with the hone, screw it in and check? PRN.

Still want to know where in the choke tube the change in the pattern (up/down/right/left) takes place and how it is done. Would seem to cause
pellet or wad deformation when the shot charge hits the turn in the choke.

Is there any real hard data on this?

Repeated firing might cause the tube to loosen and turn with unintended POI consequences and collateral damage.
 

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POI change with Briely Eccentric Chokes

Charles, the information is in the Briley Shotgun Services Section under
the Briley Thinwall Screw in Choke System.

The change in the pattern takes place in the straight section at the end
of the choke. I ordered Eccentric Chokes in Extra Full and they do not
seem to loosen in the barrel.

The patterns look and shoot as good as the original chokes, only the POI
is changed to your specifications.

You are correct about the honing.

X-factor
 
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