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Thread: Bullet Seating Depth

  1. #1
    Join Date
    Apr 2018
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    Bullet Seating Depth

    Using a Redding Competition seating die I am not able to get consistent
    seating depth. I am loading for a 6BR. The die is clean, the case holder is clean
    the cases are as exact as I can get them and yet I will get a variation in seating depth of
    +/- .0025 on a regular basis. Any help would be much appreciated.

  2. #2
    Join Date
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    Quote Originally Posted by Pagosa Scott View Post
    Using a Redding Competition seating die I am not able to get consistent
    seating depth. I am loading for a 6BR. The die is clean, the case holder is clean
    the cases are as exact as I can get them and yet I will get a variation in seating depth of
    +/- .0025 on a regular basis. Any help would be much appreciated.
    Are the necks the same size ?

  3. #3
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    Quote Originally Posted by classcat View Post
    Are the necks the same size ?
    Yes, they are all run through the same Redding bushing neck die

  4. #4
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    Dec 2017
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    is the tip of the bullet hitting the interior of the seating stem ?
    what cartridge(ok 6br) what bullet ?
    how are you seating, what press

  5. #5
    Join Date
    Feb 2004
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    257

    Bullet seating

    What tools are you using to measure seating depth?

    Do you measure from bullet tip to base of the case or ogive to base?
    Last edited by tenring; 04-10-2018 at 02:49 PM.

  6. #6
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    Are your loads compressed ?

  7. #7
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    Quote Originally Posted by retired View Post
    is the tip of the bullet hitting the interior of the seating stem ?
    what cartridge(ok 6br) what bullet ?
    how are you seating, what press
    Hitting the interior of the seating stem is a good question.
    I will check that out. Bullets are usually either Berger 65 grain Web BR, or
    Bart's 66 grain Ultra. It is a Redding "The Boss" press, cases trimmed to length with
    a Sinclair Ultimate Trimmer +.001 - 0, necks turned with a K&M neck turner +.001, -0,
    and the bullets are being seated with a Redding Competition seating die. I

  8. #8
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    Quote Originally Posted by tenring View Post
    What tools are you using to measure seating depth?

    Do you measure from bullet tip to base of the case or ogive to base?
    I measure with a piece of the barrel that duplicates the chamber. So I can measure with one end
    from ogive to base or other end lands to base.

  9. #9
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    Apr 2018
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    Quote Originally Posted by Kiwi Greg View Post
    Are your loads compressed ?
    I don't think so, but another good question.

  10. #10
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    Quote Originally Posted by Pagosa Scott View Post
    Yes, they are all run through the same Redding bushing neck die
    Let me rephrase the question . Are the necks cut ?

  11. #11
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    Quote Originally Posted by classcat View Post
    Let me rephrase the question . Are the necks cut ?
    Yes, I trim all the cases to length, very consistent with a Sinclair Ultimate Trimmer.
    But I fail to see how that could have an effect since the distance from the case holder to the
    seating die doesn't change.

  12. #12
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    Quote Originally Posted by Pagosa Scott View Post
    Yes, I trim all the cases to length, very consistent with a Sinclair Ultimate Trimmer.
    But I fail to see how that could have an effect since the distance from the case holder to the
    seating die doesn't change.
    Not the length, but the diameter. Uneven neck tension can give you uneven seating depths. Light neck tension will yield the same results.
    Last edited by classcat; 04-10-2018 at 05:34 PM.

  13. #13
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    Dec 2017
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    My OPINION, is that with that "tool"
    you cannot measure uniformly, because you cannot control
    how far into the lands you are pushing the bullet when measuring.
    .002 is nothing. The taper on the throat and the taper to the bullet make this very hard to do.
    Maybe with an optical comparitor
    IMHO, you need a bullet ogive tool sinclair stoneypoint, so you measure to a point,
    not trying to measure while not going into the lands.
    Last edited by retired; 04-10-2018 at 05:30 PM.

  14. #14
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    On your ogive tool...is the hole where the bullet inserts chamfered or not? -Al

  15. #15
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    Jul 2016
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    Surprise, AZ
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    I have had this same problem. I think it's due to a variation in insertion force on the gauge. The gauge relies on the lands of the barrel to stop the bullet, but a little engraving is easy to achieve. Apply the gauge carefully, such that your measurement device isn't compressing it into the lands (i.e. a light touch) and you may see better consistency. (Worked for me, anyway.)
    GsT

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