Ammo Energy Chart | The Slingshot Community Forum

Ammo Energy Chart

Discussion in 'General Slingshot Talk' started by Ted, Jul 15, 2014.

By Ted on Jul 15, 2014 at 6:57 PM
  1. Ted

    Ted Well-Known Member

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    The chart below shows the energy, in foot-pounds (fpe), of various ammo at various speeds. In the chart, red cells have the least energy, while dark green cells have the most energy.

    The chart shows that greater energy can be achieved by either faster speed or greater weight. For example, a 5/8” marble at 240 fps at impact with the target delivers the same energy (10.7 fpe) as a .50 cal lead ball at 160 fps, even though the marble is less than half the weight of the lead ball.

    Ammo energy chart v2.png
     
    Last edited: Jul 16, 2014
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Comments

Discussion in 'General Slingshot Talk' started by Ted, Jul 15, 2014.

    1. A+ Slingshots

      A+ Slingshots Member Vendor

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      Nice one Ted!
       
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    2. reset

      reset New Member

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      Much easier to read than some charts. And really helpful too. Thanks for this
       
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    3. Narcaleptic sling shotter

      Narcaleptic sling shotter New Member

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      That is really cool Ted! Thanks, I am supprised Clay is so high up there...
       
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    4. Ted

      Ted Well-Known Member

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      @Narcaleptic sling shotter , I think the key is the weight. The 22mm clay ball weighs about the same as a .50 cal lead ball, but is so much larger - more than five times the volume. Also, I think Bill Hays has done some tests and has found that air resistance is a significant factor with less dense ammo, so clay balls will slow down a lot more than lead balls of equal diameter, and larger clay balls will slow down even more. So if your bands or tubes shoot a 22mm clay ball at 160 fps, then by the time it reaches the target at say 10 meters, it will be significantly slower. The speeds in the chart are the speeds of the ammo at the moment of impact with the target.

      Another factor with clay is that I think some of the energy at impact goes to disintegrating the clay ball (if it breaks apart at impact). If that happens, then less energy goes into the target.
       
      Last edited: Jul 15, 2014
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    5. Narcaleptic sling shotter

      Narcaleptic sling shotter New Member

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    6. Thistle

      Thistle Guest

      WOW! This is wonderful! Thank you for doing this.
      Happy dance. [​IMG]
       
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    7. AZ Stinger

      AZ Stinger Veteran Member

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      Great info, thanks
       
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    8. flicks

      flicks Active Member

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      Great info Ted! Thanks for sharing!
       
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    9. S.S. sLinGeR

      S.S. sLinGeR Member

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      Thanks for this chart!
       
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    10. Montie Gear

      Montie Gear New Member

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      Great chart
       
    11. Toddy

      Toddy Veteran Member

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      That is superb Ted, many thanks indeed
       
    12. Ted

      Ted Well-Known Member

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      Thanks for all the kind words, everyone. I find the chart very helpful to refer to every now and again.
       
    13. learnin'

      learnin' Member

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      So how much energy is recommended for hunting various critters, such as dove, rabbit, and squirrel?
       

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