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Hornady 10mm Brass

Discussion in '10mm Reloading Forum' started by glock20c10mm, Dec 18, 2010.


  1. glock20c10mm

    glock20c10mm
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    From what I understand, Starline Brass is a harder brass than Winchester Brass. And harder brass is supposedly better for full-power loads than softer brass, specifically for first time use when new.

    Anybody know how the hardness of Hornady brass is compared to Starline or Winchester brass?


    Craig
     

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  2. MinervaDoe

    MinervaDoe
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    I wish I could help you out with this one because it is an interesting topic.
    I tried finding some data with a couple of Google searches, but nothing relevant comes up.
    Hopefully, somebody with this type knowledge will drop by.
    I have heard a number of people say that Starline brass holds up well.
    I haven't reloaded my Starline brass enough times to comment.
     

  3. crsuribe

    crsuribe
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    10mm Auto

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    This thread needs some Kegs.
     
  4. Kegs

    Kegs
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    Ol 8 fingers ;)

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    Thanks for your confidence, but the only brass I have ever reloaded has been Scharch.

    Soon I will be relading some double tap nickel plated brass, which I will have to re-work up my loads since I expect these are going to change my formula a little (my suspicion is that they may not need as much powder).
     
  5. glock20c10mm

    glock20c10mm
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    I feel your pain. I searched somewhat extensively, and also came up with nothing. Hornady manufactures it for the retail market, and someone out there must know something, so I popped the question here. I figured someone in this forum must have at least had some experience with it before, but so far, no. May just take a while before someone with the knowledge comes across my question. Or not. :dunno:


    Good Shooting,
    Craig
     
  6. Atomic Punk

    Atomic Punk
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    could do a hardness test on them all. somebody may have what you need to properly do the RC hardness test. but you could build your own small drop tower and measure dent depths. you may not be able to figure out what the hardness of each is. but should be able to figure out where they all are in comparison.
     
  7. DWARREN123

    DWARREN123
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    Grumpy Old Guy

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    I don't know about hardness but they look the same as Starline when fired in my G20SF. Have to look at the headstamp to tell them apart.
    The big difference for me is cost, the Hornady is more expensive.
     
  8. glock20c10mm

    glock20c10mm
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    Specifically on unfired cases, I think that's a perfectly good idea.
     
  9. MinervaDoe

    MinervaDoe
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    I wonder if there would also be a benefit from weighing them.

    After my PPC shoot last night, someone left behind a big batch of factory 9mm brass and it felt noticably tinnier and lighter than my own brass. Of course, I picked it up anyhow ... :supergrin:
     
  10. glock20c10mm

    glock20c10mm
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    Interesting that is was that easily noticeable. What brand is your brass, and what brand was it that you found?
     
  11. MinervaDoe

    MinervaDoe
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    I weighed the brass I found (including the primers) and it was actually heavier than some of the brass I fired. Go figure. My very subjective SWAG was wrong.
    I was shooting the FC and CCI

    PMC = 62 grains
    S&B = 60.9 grains
    FC = 59.2 grains
    CCI = 64 grains

    As to the amount of annealing and the quality of the brass, I think that gets back to your original question.

    A Google search for "brass cartridge hardness" yielded promising results. Here is a sample from the first page:

    Here is an article about annealing. It suggests a test which I believe will not accomplish what we are discussing here.
    http://www.lasc.us/CartridgeCaseAnnealing.htm

    On this site, some "machinists" discuss it. I found post #11 informative.
    http://www.practicalmachinist.com/vb/gunsmithing/cartridge-brass-specs-205640/
     
    #11 MinervaDoe, Dec 22, 2010
    Last edited: Dec 22, 2010
  12. MinervaDoe

    MinervaDoe
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    But wait, there's more ....
    So after reading the articles at the above two links, we feel like we have more information.

    But upon doing more research, we realize that brass "hardness" is determined by two things: the percentage of brass and zinc and annealing.

    More reading for your weary eyes:
    http://www.gun-tests.com/performance/jun96cases.html

    Here's a key point:
    So, we have to ask if we are really looking for harder brass, when maybe brass which has been properly annealed may have longer life.

    And finally, to go full circle (sort of) here is an article about a Hornady annealing kit.

    http://blog.sinclairintl.com/2010/03/03/product-evaluation-hornady-annealing-system/
     
    #12 MinervaDoe, Dec 23, 2010
    Last edited: Dec 23, 2010
  13. MinervaDoe

    MinervaDoe
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  14. glock20c10mm

    glock20c10mm
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    MinervaDoe,

    Thank You for sharing your research!

    The only thing I'll add, based on one of your last statements on whether or not harder brass is the way to go, is that I recall Mike McNett mentioning some time ago that new harder brass was best for full power 10mm loads.

    I guess there's still always give and take. Now I just wonder where Hornady's brass fits into the mix.


    Merry Christmas,
    Craig
     
  15. MinervaDoe

    MinervaDoe
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    You're welcome. Hopefully, someone will come up with some hardness measurements.
     
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