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How hard is it?

Discussion in 'NFA & Class III Discussion' started by 257wby, Dec 6, 2009.

  1. 257wby

    257wby Sharpshooter

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    I might have to hit you up on that. I'm booked this week, but I might hit you up later. Just to make sure, 1150 fps is the speed of sound right?
     
  2. tyromeo55

    tyromeo55 Sharpshooter

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    The speed of sound depends on temp and pressure. At sea level... 68 deg F....... in dry air.... the speed of sound is 1125 FPS

    ETA: NASA has a neat writeup and calculator for the speed of sound HERE------>

    http://www.grc.nasa.gov/WWW/K-12/airplane/sound.html
     
  3. 338Shooter

    338Shooter Sharpshooter

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    I try to keep my subsonics around 1050 fps here.
     
  4. WhiteyMacD

    WhiteyMacD Sharpshooter

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    Even though the "constant" speed of sound is 1125fps, I wouldnt stray more than 25-50fps above 1000. In fact, I would say just enough that your gun cycles reliably.
     
  5. MAS GunWorks

    MAS GunWorks Sharpshooter

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    You are correct. But like stated above most will load them around 1050 or so.
     
  6. technetium-99m

    technetium-99m Sharpshooter

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    You can load 200gr 40's to around 800-850 if that creams your twinkie.
     

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