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Thread: 300 blackout brass to 221?

  1. #1
    Boolit Mold
    Join Date
    May 2015
    Posts
    4

    300 blackout brass to 221?

    Since the 300 is based on the 221 I should be able to use standard 221 dies to reform it. Anybody done it?
    Thanks

  2. #2
    Boolit Master

    Join Date
    Mar 2011
    Location
    oklahoma
    Posts
    1,599
    it will likely be short. 300 blackout is 1.6". 221 is 1.4"

  3. #3
    Boolit Buddy adcoch1's Avatar
    Join Date
    Oct 2016
    Location
    Centralia Wa
    Posts
    236
    Did one the other day to test out the new(used) dies I just got. couldn't find my caliper to measure length though, gonna try to look into it again tomorrow.
    "Give me liberty, or give me death!" Patrick Henry ,March 23, 1775

  4. #4
    Boolit Master

    rockrat's Avatar
    Join Date
    Aug 2005
    Posts
    3,804
    300 blackout is 1.368" and the fireball is 1.4", so you will probably be a bit short.

    Note--it will be short. Just ran one thru my 221 die and it came out to 1.366" long, so you will be 0.034" too short in the neck. It would work, but you might have to ream necks, depends on your chamber and brass neck thickness.

  5. #5
    Boolit Mold
    Join Date
    May 2015
    Posts
    4
    Maybe they shortened the fireball case? It doesn't sound like much difference.
    I don't turn necks anyhow.

    Thanks for trying one.

  6. #6
    Boolit Master

    Join Date
    Mar 2011
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    oklahoma
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    Depending on how generous your chamber is or is not, you might not have a choice on turning case necks. If too thick, you will end up with high pressures. But if your chamber is generous, reform cases might work just fine.

  7. #7
    AKA: GRMPS Conditor22's Avatar
    Join Date
    Dec 2018
    Posts
    1,169
    300 BO comes from 223/556. why waste/play with 300 bo brass when a 223/556 are plentiful and will work?

  8. #8
    Boolit Buddy
    Join Date
    Jun 2018
    Posts
    337
    I'll trade you 223/556 brass for 300 blackout brass. Why waste 300 blackout brass?
    Last edited by ThomR; 09-14-2019 at 09:39 PM.

  9. #9
    Boolit Buddy gnostic's Avatar
    Join Date
    Jan 2014
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    Somewhere over the rainbow...
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    474
    I make 221 Fireball all the time out of 223's, by running through a trim die. You'll have to neck ream them or they'll be way too thick...

  10. #10
    Boolit Grand Master Texas by God's Avatar
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    Mar 2016
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    Texas
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    Free basic brass for the win. Save the .300s for .300s; use.223 for making .221s if you can't find them.

    Sent from my SAMSUNG-SM-G930A using Tapatalk

  11. #11
    Boolit Master 15meter's Avatar
    Join Date
    Feb 2017
    Location
    SE Michigan
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    835
    Quote Originally Posted by Texas by God View Post
    Free basic brass for the win. Save the .300s for .300s; use.223 for making .221s if you can't find them.

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    Unless you have a 221 Fireball and not a 300 Blackout and pickup range find 300 blackout brass for free

    And your Fireball likes really, really short brass.

  12. #12
    Boolit Buddy
    Join Date
    Jun 2013
    Location
    Lynn Ma
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    394
    If you can't find 221 Fireball brass you could reform 17 Fireball then no need for neck reaming.

  13. #13
    Boolit Master

    dale2242's Avatar
    Join Date
    Oct 2007
    Location
    SW Oregon
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    1,503
    Lapua makes excellent 221FB brass.
    I`m using it in a custom rifle.
    It`s a little spendy but better than trying to form brass from 223.
    At least it is to me.....dale

  14. #14
    Boolit Master

    Join Date
    May 2015
    Location
    Anchorage, AK
    Posts
    789
    What Dale said. Made 300 221FB from new Win brass. After trimming and neck turning, time and money spent, Lapua brass is nice. Worth it in the long run.

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BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
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