GUN Ballistics

Discussion in 'On Topic' started by Resin, Jan 16, 2008.

  1. Resin

    Resin OT Supporter

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    So is all production guns in a National database? When I bought my M&P is came with a shell that I assume would be added to some data base. Are hollow tips traceable?
     
  2. Soybomb

    Soybomb New Member

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    Only a couple states have a database, thats all the brass is there for. To my knowledge those ballistic databases have been nothing more than a waste of money.
     
  3. Resin

    Resin OT Supporter

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    i always hear "they can trace the bullet back to you" :noes:
     
  4. johnson

    johnson New Member

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    I dont see how.
     
  5. fatmoocow

    fatmoocow bored OT Supporter

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    something like 80% failure rate
     
  6. FusionZ06

    FusionZ06 /\__/\__/\__0>

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  7. Slick26

    Slick26 Gun|Bike|Cigar|PS3|Beer |Whisky|Night Crew

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  8. Keesh

    Keesh New Member

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    They include a spent casing and it goes into a database depending on the state, I know CA has one for sure.

    I really doubt someone is going to spend months huddled over a microscope comparing thousands and thousands of 9mm casings especially with how easily one can swap a firing pin.
     
  9. Furner

    Furner New Member

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    maybe.....if they have enough evidence to seize the gun of a suspect, and run ballistics, and the suspect has not switched out components, or run about 100 rounds through the gun after the supposed crime...........maybe
     
  10. Resin

    Resin OT Supporter

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    isn't it the barrel that leaves marks on the round?
     
  11. Furner

    Furner New Member

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    there are many different ways, theories, myths. some use the firing pin marking. which is why a casing is included when you buy your gun. its easier to recover than a bullet, both for record keeping and crimescene ballistics.

    BUT
    it has been found that the firing pin impression changes often. as does the barrel signature left on a bullet.
    also, it takes about 10 seconds with a simple file to change the signature of your firing pin. dont even have to break down the gun most of the time.
    ALSO
    barrels are easy to switch out. any good murderer would buy a new barrel, cash, and dispose of it or hide it after they commit their dirty deeds.
    ALSO
    shooting through a barrel could change its signature, especially if you used the abrasive "cleaning" bullets you can buy. a murderer could shoot someone, and then run a few boxes of regular ammo through the barrel, and that could easily change the signature left.
     
  12. xpinchx

    xpinchx hes got a nice cock, on the thin side but its stil

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    I find this thread interesting. :hsugh:
     
  13. mongorunner

    mongorunner New Member

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    [​IMG]
     
  14. Paul Revere

    Paul Revere OT Supporter

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    i got a spent casing with my sig p226r, i assumed it was from ONLY a test fire, and not for some stupid database :hs: :o
     
  15. Slick26

    Slick26 Gun|Bike|Cigar|PS3|Beer |Whisky|Night Crew

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    Because that's what it was for.
     
  16. Paul Revere

    Paul Revere OT Supporter

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    :h5:
     
  17. jeepilot

    jeepilot Banned

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    aaahh.... well this thread was a good read in paranoia....




    It's a test case.
     
  18. PanzerAce

    PanzerAce Active Member

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    CA doesn't have that, you are thinking of MA :o
     
  19. Initial E

    Initial E New Member

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  20. Keesh

    Keesh New Member

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    You're probably right, I thought I had read it a while ago in one of my handgun manuals and I just looked back and it didn't say CA, my bad :o
     
  21. mattsb2000

    mattsb2000 OT Supporter

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    This is why I use a revolver when I murder people.
     
  22. idleprocess

    idleprocess Bring a dollar with you baby in the cold cold grou

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    In theory, firing pins, extractors, and the slide itself leaves a unique set of marks on brass. Of course, all these change over time and after use, but that hasn't stopped legislatures from authoring dumb laws and maintaining silly databases / agencies...
     
  23. Resin

    Resin OT Supporter

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    maybe i've been watching too much CSI
     
  24. CString

    CString New Member

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    the bullet that is in there is from a test fire.
    I have a B.S. in forensic science. CSI is full of shit most of the time. anyways, the lands and grooves in your barrel do leave specific stria on rounds fired from your gun. bullets could be "traced back" to your gun. it's usually not by a registry though. police would have to have some reason to suspect you, at which point they would confiscate your weapon. then they would go and test fire it and using a comparison microscope compare the bullet from the crime with the one from your weapon. it's not really that hard. i found a match the first time i tried during my internship. even if a cartridge from your weapon is in IBIS it is still hard as hell to say 100% that a cartridge matches. IBIS isn't like it is on CSI. the computer doesn't run every cartridge in IBIS and then come up with one match. it gives you a shitload of matches ranked on percentage of similarity. then you have to go through one by one and compare them to your known. it's a pain in the ass.
    *gratuitous pics from internship included*
    Computer for entering cartridges into IBIS
    [​IMG]
    Indoor water tank and range
    [​IMG]
    Rifle from OIS
    [​IMG]
    Evidence sheet w/goodies listed
    [​IMG]
     
  25. Hooch

    Hooch New Member

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    Some of the old Shiloh Sharps buffalo guns used paper wrapped bullets and Schofield wrote a book on it that lots of people swore by. Shooting soft lead bullets through long barreled rifles can lead to lead build up in the rifling, destroying accuracy. The paper kept the bullet from touching the rifling, hence reducing lead fouling. It also cleaned the BP fouling from the previous shot as it traveled the barrel.
    Now let's talk about modern jacketed bullets and modern cartridges, and use the .308 Winchester cartridge as an example. The bullet diameter is .308 inches. Part of the rifle barrel is .308 (the grooves) and part of the diameter is .304 (the lands). Take a .308 pill, wrap it in paper, and now you'll have a thicker bullet. This thicker bullet could very possibly cause an increase in chamber pressure to the point of being dangerous. So now what?
    Well, there is a new cartridge on the market called the .338 Federal. It is simply a .308 Winchester cartridge with the neck enlarged to accept a .338 bullet. So, if you could wrap a .308 pill with paper till it reached a .338 diameter and fire it in a rifle chambered for the .338 Federal, you just might be able to produce something safe to fire that is paper wrapped and untraceable.
     

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