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Shooting Forum - Firearms licencing information


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bullet speed??

  • 27-11-2008 1:06am
    #1
    Gus Ivey
    Registered Users, Registered Users 2 Posts: 635 ✭✭✭


    just a lil question to solve an arguement



    if you have a gun and you are told the speed of the bullet is 1km per second. is that speed measured when the bullet first leaves the gun or the average speed over the bullets journey.

    because i was wondering if a bullet slowed down much during flight. so what im tryin to say is , would that bullet travel 1km in one second , or wud it only travel say 500m in a half a second and then drop to the ground.( i know this might not sound realstic, im just using these figures as a n example)

    i was wondering this beacause i had an arguement ,, i thought they would only use the distance it would travel to one second because 1 is a whole number , and it is easier to say 1km per second , rather than 250m per quarter second, for instance


Comments

  • #2
    IRLConor
    Subscribers Posts: 4,076 ✭✭✭IRLConor


    Usually the figure quoted is muzzle velocity, in other words the speed it's going when it leaves the gun. Muzzle velocities are usually quoted in feet per second or meters per second.

    Different bullets lose speed at different rates. The subsonic .22 rounds I shot on Monday lose 15% of their velocity by the time they reach 100m (that is if they got that far, I was shooting at 25yd). Having a look at a ballistic calculator, a .308 might only lose 7.5% of its velocity by 100m.


  • #3
    Rovi
    Closed Accounts Posts: 8,570 ✭✭✭Rovi


    Here's a real world example:

    A 50 grain .223 Remington doing (a little over) 1000M/Sec (3280Ft/Sec) at the muzzle will arrive at 600 meters 1 second later (going at 371M/Sec, 1217Ft/Sec), and will take a total of 2.35 seconds to get out to 1000 meters, doing 255M/Sec (836Ft/Sec).

    Range (Metres)|Velocity (M/Sec)|Time of Flight
    0|1005.8|0.000000000
    100|869.4|0.106975345
    200|745.8|0.231182108
    300|632.8|0.376765677
    400|530.6|0.549421380
    500|441.7|0.756255840
    600|371.0|1.004064150
    700|323.7|1.294118725
    800|294.2|1.619173350
    900|272.8|1.972962084
    1000|255.3|2.352765685

    As an quick point of interest, it takes 0.75 seconds for it to cover the first 500 meters, and another 1.9 seconds to cover the second 500 meters.


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