Help wanted: Problem with trimming 9mm

Discussion in 'Ammunition & Reloading' started by Shopfox, Feb 7, 2020.

  1. Shopfox

    Shopfox Well-Known Member Supporter

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    I reloaded and shot through my first batch of 9mm brass with no problems. I knew some brass were close to needing trimmed prior to firing, so after firing them, I bought a Lee gauge and shellholder for my Lee trimmer.

    After cleaning and resizing, I went to trim, and found my trimmer would only fit into the mouth of about 1/2 of my cases.

    Not sure if the problem is originating with the brass or dies. Advice for troubleshooting?
     
  2. Rifling82

    Rifling82 Well-Known Member Supporter

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    I’m curious about this, I’ve never had to trim 9mm brass
     
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  3. OLD Ron

    OLD Ron Well-Known Member

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    This is after you size them ?
     
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  4. Shopfox

    Shopfox Well-Known Member Supporter

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    Yes
     
  5. Gatoragn

    Gatoragn Well-Known Member Supporter

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    I have never trimmed straight wall pistol brass.
     
  6. Shopfox

    Shopfox Well-Known Member Supporter

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    I got in the habit of trimming from the higher pressure 444 Marlin, and 44 Mag.

    I'm also trying to do load development/accuracy testing for 100 yard 9mm shooting, so I'm doing all the tricks I know to uniform the brass (flash hole deburr, primer pocket uniforming, sorting by headstamp, etc.).
     
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  7. Rifling82

    Rifling82 Well-Known Member Supporter

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    I think I would buy a bunch of new 9mm brass
     
  8. Shopfox

    Shopfox Well-Known Member Supporter

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    It was about $25 per 100 for virgin brass. $0.16 to $0.18 for loaded ammo. The cheapskate in me can't buy new.
     
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  9. OLD Ron

    OLD Ron Well-Known Member

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    Might be cheaper in the long run than buying inside & outside mics .
     
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  10. Rifling82

    Rifling82 Well-Known Member Supporter

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    It’ll be interesting to see what load you come up with
     
  11. locutus

    locutus Well-Known Member Supporter

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    I've never trimmed a pistol case.
     
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  12. Shopfox

    Shopfox Well-Known Member Supporter

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    Do you measure, then toss when long - or just don't check...?
     
  13. locutus

    locutus Well-Known Member Supporter

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    Don't check.
     
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  14. OLD Ron

    OLD Ron Well-Known Member

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    You are trying to get a load the best you can. That you can count . I wouldn't toss any brass .... just check to get them as alike as you can .
    Measure & weigh everything & then you will be able to build the best loads you can . The rest shoot & have fun with it . Having a 4k pool cue doesn't make you Minnesota Fats .
    :)
     
  15. Oldoutlaw

    Oldoutlaw Well-Known Member Supporter

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    Are these all the same brass? For example all of one manufacturer and lot #. Same bullet weight they fired? What is the thickness of the longer brass and the shorter brass.
    Those all vary from ammo makers. You may be trying to call it to tight for a pistol caliber versus rifle caliber. Dunno?
     
  16. Gatoragn

    Gatoragn Well-Known Member Supporter

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    I just clean and reload until lost or split.

    If I undertook the project you describe, I would start with sorting by headstamp. Use all Federal, Winchester, whatever you believe is most uniform and go from there.
     
  17. austin92

    austin92 Well-Known Member

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    I have those Lyman head space gauges for most of my calibers. After I resize I drop them in to check if they need trimmed or ran through the bulge buster. I’ve noticed on 45 acp that the case mouth hangs up on the pilot for the lee trimmer, it’s the only caliber I have that does that so I planned on taking it to a machinist and having them turn a few thousands off of it. I’m sure I could get away with not doing any of that but it makes me feel better, others shoot my guns sometimes and the last thing I want is anyone getting hurt because I didn’t “feel like” checking case length.

    I keep an old Spanish 38spc revolver that was blown apart by a reload hanging on the wall as a reminder of what can happen if I get complacent. It was a friends gun, another friends reload, and I was 5’ from it when it gave up. No one was hurt but there were holes in the porch roof we were shooting under. Makes you think...
     
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  18. PaBushMan

    PaBushMan Well-Known Member

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    Same here i just keep loading them until they ware out. Rifle cases i do trim when needed.
     
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  19. partdeux

    partdeux Well-Known Member Supporter

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    Never trimmed 9mm.

    is your crimp sufficient? Is your OAL correct for your chamber?
     
  20. Txhillbilly

    Txhillbilly Well-Known Member

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    Most straight walled ammo cases never need trimming,only bottle necked cases. There's no funnel on a straight walled case to make the brass flow forward when fired,it just expands outward to the chamber.
     
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