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Thread: Cases & Overpressure

  1. #16
    Join Date
    Mar 2008
    Location
    Southern Minn
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    952
    I'd get a fitted sizing die to start with.

  2. #17
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
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    7,192
    Roger, I think he needs another die, but I don't think it will size the web and rim.

  3. #18
    Join Date
    Apr 2015
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    1,250
    His high pressure indicators at what most are calling "reasonable" loads,
    make's me think something is not the "same" as other rifles in this class.
    We need very specific data on COAL, bullet length etc.
    Something ain't right.

  4. #19
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
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    7,192
    Quote Originally Posted by CMaier View Post
    His high pressure indicators at what most are calling "reasonable" loads,
    make's me think something is not the "same" as other rifles in this class.
    We need very specific data on COAL, bullet length etc.
    Something ain't right.
    I don't think those things mentioned would matter. How many people have seen rim diameter expand to not fit a shell holder?

  5. #20
    Join Date
    Apr 2015
    Posts
    1,250
    SOMETHING IS AMISS...
    We need more data, cause what he is doing does not match
    what you guys are doing.

    Quote Originally Posted by Butch Lambert View Post
    I don't think those things mentioned would matter. How many people have seen rim diameter expand to not fit a shell holder?

  6. #21
    Join Date
    Feb 2003
    Location
    Tennessee
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    5,275
    Just for grins...what shellholder are you using?

  7. #22
    Join Date
    Nov 2015
    Posts
    42
    Quote Originally Posted by Wilbur View Post
    Just for grins...what shellholder are you using?

    I use a Redding #12 shellholder.

    When you said that the case should not expand more than 0.0005, what do yo mean with "after the first firing"?
    Is this after fireforming?
    I compared my new .220Lapua with (fireformed) cases that have been reloaded 4 times.
    Also I use a Wilson neck die and a Redding small base body die.

  8. #23
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
    Posts
    7,192
    Remember a die, small base included will not size the web. Have you measured a before and after rim. I have some that have multiple firings in a plinking rifle and the rims measure the same.

  9. #24
    Join Date
    Nov 2015
    Posts
    42
    Quote Originally Posted by Butch Lambert View Post
    Remember a die, small base included will not size the web. Have you measured a before and after rim.


    Can you please explain the "web"? Sadly my english is not the best.
    Also I will measure the rims later.

  10. #25
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
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    7,192
    Quote Originally Posted by )Stephan View Post
    Can you please explain the "web"? Sadly my english is not the best.
    Also I will measure the rims later.
    The web is the area above the groove above the rim.

  11. #26
    Join Date
    May 2010
    Location
    Cornville, ME
    Posts
    146

    Tight bore???

    A friend has a situation whereby he couldn't use what were considered average loads due to a pressure problem. Turned out his barrel had a tight bore as the grooves were not cut as deep as they generally are. The maker made it right and now the barrel is good pressure wise.

  12. #27
    Join Date
    Nov 2015
    Posts
    42
    Thanks for all the replies!

    I checked the cartridge OAL: 2,089"

    And bullet length: 0,835"

    As I said I already use a drop tube and a load above 30grs just won't fit.

    Also I checked the groove of fired and new cases and there was no difference - so I believe this is good.
    (I did throw the "problem cases" away by now)

  13. #28
    Join Date
    Apr 2015
    Posts
    1,250
    So he has a full.25" plus bullet in the case...
    Is this a short oal ?

  14. #29
    Join Date
    Feb 2003
    Location
    Poetry, Tex.
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    Quote Originally Posted by CMaier View Post
    So he has a full.25" plus bullet in the case...
    Is this a short oal ?
    With the throat that I have, he is only about .030" shorter than mine. I think he is good to go.

    You can put a small wire spring in your drop tube and very slowly drop your powder. I bet you can put 31grn. in it pretty easy.

    I need to qualify my post. OAL will vary quite a bit depending on the bullet shape.
    Last edited by Butch Lambert; 05-20-2016 at 07:06 PM.

  15. #30
    Join Date
    Oct 2003
    Location
    Southern Indiana
    Posts
    1,753
    The only times I ever have had problems with cases not fitting in a correct shellholder....the extractor had a burr and was burring the case rim. Small diamond file will fix both.

    Hovis

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