Do Fixed O/U Shotguns Change Choke Due to Wear?

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  • calicojack

    American Sporting Rifle
    MDS Supporter
    May 29, 2018
    5,390
    Cuba on the Chesapeake
    I saw an O/U on Gubroker. It's fixed choke full over full, but the seller says it gauges at cylinder. Is that because of wear??
     

    jjbduke2004

    Ultimate Member
    Oct 19, 2008
    1,764
    Morris Oblast, NJ SSR
    I saw an O/U on Gubroker. It's fixed choke full over full, but the seller says it gauges at cylinder. Is that because of wear??

    I imagine someone bored it out to cylinder for "reasons" or the seller could not properly measure with calipers. Also likely, that company's bore and choke dimensions aren't "standard" (and there are a lot of "standards").
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,912
    Socialist State of Maryland
    It's risky to purchase a shotgun with bored out barrels thinking that you can have removable chokes installed. The reason is that, if it wasn't done correctly, there may not be enough steel to cut threads for removable chokes.

    As skeetshooter has stated, it is expensive.
     

    calicojack

    American Sporting Rifle
    MDS Supporter
    May 29, 2018
    5,390
    Cuba on the Chesapeake
    It's risky to purchase a shotgun with bored out barrels thinking that you can have removable chokes installed. The reason is that, if it wasn't done correctly, there may not be enough steel to cut threads for removable chokes.

    As skeetshooter has stated, it is expensive.

    This has been very helpful - thanks.
     

    calicojack

    American Sporting Rifle
    MDS Supporter
    May 29, 2018
    5,390
    Cuba on the Chesapeake
    At least the seller was honest enough to state (for all practical purposes) it was bored out. Lesson learned; if you buy are buying fixed choke, measure with calipers before accepting.
     
    Last edited:

    sxs

    Senior Member
    MDS Supporter
    Nov 20, 2009
    3,391
    Anne Arundel County, MD
    Usually when chokes are opened, there is still some construction as cyl isn't generally all that useful. If a bore actually is cyl, I would wonder if the barrels were cut.

    If there is enough meat on the barrels, Mike Orlen can install tubes much cheaper than Briley. He is a moderator over on Shotgun world.
     

    E.Shell

    Ultimate Member
    Feb 5, 2007
    10,317
    Mid-Merlind
    How a choke 'gauges' doesn't always mean what it seems, because the choke constriction is relative to the bore diameter. If the choke gauges big, but the bore is also on the large side, it may still deliver the marked patterns. A gross analogy would be that a full choke 12 gauge isn't the same size as a full choked 16 gauge. A comparison; actual bore vs muzzle, is needed.
     

    John from MD

    American Patriot
    MDS Supporter
    May 12, 2005
    22,912
    Socialist State of Maryland
    How a choke 'gauges' doesn't always mean what it seems, because the choke constriction is relative to the bore diameter. If the choke gauges big, but the bore is also on the large side, it may still deliver the marked patterns. A gross analogy would be that a full choke 12 gauge isn't the same size as a full choked 16 gauge. A comparison; actual bore vs muzzle, is needed.

    Quite true.
     

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