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Q for ballistics, barrel experts

Discussion in 'Shooting Related Threads' started by FLAKETM, Jul 22, 2010.

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  1. FLAKETM

    FLAKETM TS Member

    Joined:
    Jan 29, 1998
    Messages:
    458
    What happens to pattern if you use a choke tube for a 736 bore in a barrel with a 742 bore? Thanks
     
  2. mag410

    mag410 Active Member

    Joined:
    Jan 29, 1998
    Messages:
    828
    Location:
    NE Mississippi
    If the .736"ID chokes were made to closely fit the .736"ID barrel, the lead-in into the choke may be less than .742". You should very carefully measure the breech end of the choke to make sure the lead-in is larger than .742". Otherwise you will at best be picking up the choke after it has been blown out into the field, at worst you will end up with a blown barrel.

    If the lead-in of the .736"ID choke is large enough, then you are going to end up with about ~1/2 choke size less choke.

    Michael Goines
     
  3. Bob Schultz

    Bob Schultz Well-Known Member Supporting Vendor

    Joined:
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    2,741
    Location:
    Tuxedo NC
    Assuming (dangerous territory here...) that the threads are the correct size for the barrel, your main concern would be the bore diameter and the diameter of the choke tube where the tube meets the inside of the barrel. Most choke tubes are 6 to 10 thousandths larger than the bore at this point. They do this in case one is a bit out of round the shot won't catch it as it leaves the barrel. BE CAREFUL and have someone with a bore mic check the tubes and the bores before attempting to fire!

    Bob
     
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