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Thread: 6BR/22BR Lapua: Max Unsupported Case?

  1. #1
    Join Date
    Jan 2015
    Location
    Greenwood, Ca
    Posts
    122

    6BR/22BR Lapua: Max Unsupported Case?

    I have't worked with these cartridges before because they just aren't that common in my game. This is probably a very obvious thing for you all.

    I thought I read somewhere years ago that the 6BR and 22BR Lapua case heads were shorter than most others and could be dangerous with too large chamfer at the chamber end. This is going to be a repeater so I'd like to make sure it feeds decently from a mag so I'd like to get the largest chamfer that is safe. Would .160"-.170" of unsupported case be safe with this cartridge? I don't have brass on hand to measure the case head thickness.
    Last edited by Rubicon Prec.; 08-24-2018 at 11:28 AM.

  2. #2
    Join Date
    Feb 2004
    Location
    Austin, Texas
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    230
    You can see from this how thick/thin the web is relative to the typical neck wall for comparison.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  3. #3
    Join Date
    Feb 2003
    Location
    Houston, Texas
    Posts
    7,004
    Quote Originally Posted by Rubicon Prec. View Post
    I have't worked with these cartridges before because they just aren't that common in my game. This is probably a very obvious thing for you all.

    I thought I read somewhere years ago that the 6BR and 22BR Lapua case heads were shorter than most others and could be dangerous with too large chamfer at the chamber end. This is going to be a repeater so I'd like to make sure it feeds decently from a mag so I'd like to get the largest chamfer that is safe. Would .160"-.170" of unsupported case be safe with this cartridge? I don't have brass on hand to measure the case head thickness.
    To add to what Nez posted, here is the actual thickness of the web of a Lapua 6BR case.

    http://benchrest.com/attachment.php?...1&d=1535138461

    With 6PPC and 6BR cases, I just break about a .010 bevel, especially with a Stiller drop port. Of course, these are solid bottom Benchrest Rifles where the case doesn't depend on the chamfer.
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  4. #4
    Join Date
    Jan 2015
    Location
    Greenwood, Ca
    Posts
    122
    Excellent info. Thanks.

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