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Concentricity..Issues or me?

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Unread 04-05-2005, 07:04 PM
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Concentricity..Issues or me?

Ok..I've spent what I believe is the utmost care in prepping my (new) Lapua case 6.5-284 Cases. I ran the necks over and Sinclair Concentricity gauge and had .001-.002 runout on the necks if that! Now..Seating a few bullets in those cases I'm getting .003 on some and up to .006 on the others. I'm using a Redding Comp seater die and the proper shell holder.

Why am I getting this runout up to .006 on some cases and not others. The bullets are Sierra 142 gr HPBT match kings. None of the necks are turned and all were sized with a Redding Standard F/L die with expander ball.YUK I figured this was OK because of the low runout on the necks after sizing.

Any advise would be great. Let me know if I left out any important info

Oh..Neck thickness on all cases was right on the money with .001 or less vari.
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    Unread 04-05-2005, 07:25 PM
    Silver Member
    Join Date: Aug 2004
    Location: utah
    Posts: 302
    Re: Concentricity..Issues or me?

    It is the standard F/L die ,it over sizes your neck. get an S-die with a bushing or a comp die with a bushing and the problem most likely disappear.
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    Unread 04-05-2005, 07:29 PM
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    Re: Concentricity..Issues or me?

    Just as an test. I took one of the cases that was giving me grief. Pulled the bullet. Resized the case...Checked neck runout and got .001. Then checked thickness 001-002 vari. Reseated a bullet and got .005 runout on the bullet and .002 runout on the neck while the bullet was seated. Pulled the bullet again and then cleaned up the neck (turned to cut 75%) seated another bullet (new one) and now got .003 runout...Hmmmmmmmmmmm

    Even those these cases show little runout and not much vari in thickness..Ya think I should turn the necks anyway? I thought with suck little neck runout that the neck turn cut would of cleaned the whole neck up...No sir ree bob! Just part of the neck

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    Unread 04-06-2005, 03:57 AM
    dcb dcb is offline
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    Join Date: Jun 2004
    Location: Ohio
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    Re: Concentricity..Issues or me?

    redding only gurantees there fl die with and expander to size
    .003" run out! .003" to .007 is fairly common.
    I would fire form the cases first before i started carvin on them.
    I have switched over to collet dies. with win brass necks cleaned up to 60/70% run out is less than .0015"
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    Unread 04-06-2005, 11:06 AM
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    Join Date: Jul 2001
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    Re: Concentricity..Issues or me?

    Sounds like the seating die plunger is not bearing evenly on the ogive of your bullets. This forces the bullets crooked when seated. NO good.

    Deepen the cavity in the plunger. Doesn't matter what you use. Just make sure that the tip is not bottoming out first. I would just take a Dremel to it. A drill might not be hard enough.

    With this done, the bullet will now only contact the base of the plunger at the ogive. Way more consistent and usually solves seating runout issues. Of course, you can switch to another die if this persists as something else is hanging up.

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    Unread 04-06-2005, 03:36 PM
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    Re: Concentricity..Issues or me?


    Checked that and am getting no contact on nose of bullet. I really think is the necks
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    Unread 04-06-2005, 04:32 PM
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    Join Date: May 2004
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    Re: Concentricity..Issues or me?

    I think brian b hit it. My 6.5 and 300WSM did the same thing. The FL die sized the sh-- out of the brass. The bushing solved my problem. With virgin brass, before the neck bushing came I had better results just running the ball through. 1/2 the runout as FL
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