Ballistics musing 9mm

This is a discussion on Ballistics musing 9mm within the Defensive Ammunition & Ballistics forums, part of the Defensive Carry Discussions category; I have looked for data on the influence of barrel length on velocity/energy. Having not found anything to my taste, I created a chart from ...

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Thread: Ballistics musing 9mm

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    Distinguished Member Array jfl's Avatar
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    Ballistics musing 9mm

    I have looked for data on the influence of barrel length on velocity/energy.
    Having not found anything to my taste, I created a chart from Glock data. Since it is from Austria, the units are metric.
    Velocity in meters/second.
    Energy in joules.
    However the barrel length is in inches.
    If you need to convert:
    - velocity: meter/second x 3.32 = feet/second
    - energy: joules x 0.738 = foot.pound
    The dotted line is a linear extrapolation - constant pressure - not true but not very false .

    One interesting fact I found was that by putting the G-19 barrel in my G-26 (9mm) the energy level is 5% higher than a G-27 (.40) and the muzzle velocity 23% higher (lighter bullet).
    Both are way over the G-30 (.45 ACP - 3 3/4" barrel); of course, te ratio of barrel length to bore diameter, with short barrels penalize the larger bore heavily.

    Just numbers; I don't want to start another "caliber war"

    Extrapolating to revolvers, bear in mind that the barrel length of a revolver does not include the cylinder, so a 2" snubby compares to a 3.5" pistol. OTOH the cylinder gap takes its toll ...

    Click on the thumbnail to see the graph.

    [IMG][/IMG]

    If you know of similar data, please let me know.
    The first rule of a gunfight: "Don't be there !"
    The second rule: "Bring enough gun"

    jfl
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    Member Array cv7713's Avatar
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    Quote Originally Posted by jfl View Post
    Just numbers; I don't want to start another "caliber war"
    Yeah, no need to start a debate. Besides, we all know 9mm is a better than a .45

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    Distinguished Member Array jfl's Avatar
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    Quote Originally Posted by cv7713 View Post
    Yeah, no need to start a debate. Besides, we all know 9mm is a better than a .45
    Absolutely
    The first rule of a gunfight: "Don't be there !"
    The second rule: "Bring enough gun"

    jfl
    (NRA Life Member/Instructor - GOA - IDPA - GSSF - ex-IHMSA)

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    Ex Member Array Ram Rod's Avatar
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    Any time I see 'joules', I think of electricity. 1-10 billion joules would be in an average bolt of lightning. Sorry......just musing myself. I'm easily mused! ;)

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    Distinguished Member Array coffeecup's Avatar
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    Yep, no need to start another caliber war because we all know that tiny little holes are more effective than large gaping wounds.

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    Senior Member Array Beans's Avatar
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    Yeah, no need to start a debate. Besides, we all know 9mm is a better than a .45





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    Distinguished Member Array Stetson's Avatar
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    I have both so let's not go down this road again.

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    1 well placed shot is better than 5 not so good.



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    Quote Originally Posted by jfl View Post
    I have looked for data on the influence of barrel length on velocity/energy.
    <snip>
    If you know of similar data, please let me know.
    Check out the manual for the Kel-Tec Sub-2000. This is a rifle that shoots handgun rounds (9mm & .40S&W). Page 16 or 17 should have some data for you.

    http://www.kel-tec-cnc.com/images/do...ub2kmanual.pdf

    It is a great way to see the difference between 4 inch and 16 inch.
    Last edited by Darkwater; November 20th, 2008 at 11:57 AM.

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    CDH
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    Quote Originally Posted by jfl View Post
    I have looked for data on the influence of barrel length on velocity/energy.
    Having not found anything to my taste, I created a chart from Glock data. Since it is from Austria, the units are metric.
    Velocity in meters/second.
    Energy in joules.
    However the barrel length is in inches.
    If you need to convert:
    - velocity: meter/second x 3.32 = feet/second
    - energy: joules x 0.738 = foot.pound
    The dotted line is a linear extrapolation - constant pressure - not true but not very false .

    One interesting fact I found was that by putting the G-19 barrel in my G-26 (9mm) the energy level is 5% higher than a G-27 (.40) and the muzzle velocity 23% higher (lighter bullet).
    Both are way over the G-30 (.45 ACP - 3 3/4" barrel); of course, te ratio of barrel length to bore diameter, with short barrels penalize the larger bore heavily.

    Just numbers; I don't want to start another "caliber war"

    Extrapolating to revolvers, bear in mind that the barrel length of a revolver does not include the cylinder, so a 2" snubby compares to a 3.5" pistol. OTOH the cylinder gap takes its toll ...

    Click on the thumbnail to see the graph.

    [IMG][/IMG]

    If you know of similar data, please let me know.
    Hell, just pull out a sheet with the above information on a bad guy and you'll bore him to death.
    Won't even need to shoot him.

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    Can't we all just get along?

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    VIP Member Array sgtD's Avatar
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    I don't know, but all that math is making my head hurt.
    When you've got 'em by the balls, their hearts & minds will follow. Semper Fi.

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