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Thread: calulating energy ft/lbs ?????

  1. #1
    Distinguished Member 223's Avatar
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    calulating energy ft/lbs ?????

    Hi

    can anybody tell me or calculate for me the ft/lbs energy that the 2 loads below will produce ??????


    load 1= 243(federal brass), 31 grains of n150, OAL 2.670 , sierra 100 spitzer bt(1560) , mean speed 2534 fps

    load 2= 308(sako brass), 42 grains of n150, OAL 2.756, sierra 150 grain spitzer bt (2125) , mean speed 2405 fps

    Many thanks

    ATB
    Dave

  2. #2
    [QUOTE=223;371487]Hi

    can anybody tell me or calculate for me the ft/lbs energy that the 2 loads below will produce ??????


    load 1= 243(federal brass), 31 grains of n150, OAL 2.670 , sierra 100 spitzer bt(1560) , mean speed 2534 fps

    load 2= 308(sako brass), 42 grains of n150, OAL 2.756, sierra 150 grain spitzer bt (2125) , mean speed 2405 fps

    Many thanks

    ATB
    Dave[

    http://www.beartoothbullets.com/resc...php/energy.htm

    Mike

  3. #3
    Distinguished Member 223's Avatar
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    bloody hell that was quick ,thankyou

    ATB

    Dave

  4. #4
    The way I always use...

    Velocity x velocity x bullet weight divided by the magic number 450240 gives muzzle energy in ft/lbs

    Not quite sure where the magic number comes from but I know part of it is that there are 7000 grains in a pound

  5. #5
    The figure I use is: Divide by 450400 from my Lyman Manual. So, as given in a previous post, Bullet weight x Velocity x velocity, divide by 450400 = ft/lbs energy. Obviously downrange vel. & energy are important too.
    Your .243 = 1425.65 ft/lbs & .308 = 1926.29 ft/lbs
    Blaser K95 Luxus Kipplaufbüchse .25-06Rem. Zeiss 8x56, 110gn Nosler Accubond = Game Over!

  6. #6
    Don't mean to hijack the thread but I'm curious about how to get the recoil energy?.

  7. #7
    Quote Originally Posted by private fraser View Post
    Don't mean to hijack the thread but I'm curious about how to get the recoil energy?.
    Not so quick this time, but:

    http://www.handloads.com/calc/recoil.asp

    Rough data:

    http://www.chuckhawks.com/recoil_table.htm

    ATB

    Mike
    Last edited by YoungGun; 05-05-2012 at 07:31.

  8. #8
    Thanks Mike, well done.

    From the second link it looks like the .600 nitro express is a real Desperate Dan gun

    fraser

  9. #9
    I think recoil is quite a subjective thing and also dependsa lot on stock design. I have not fired a .600 nitro, but have shot .577 nitroand .50 BMG neither of which were particularly unpleasant to fire. Conversely, ashooting companion had a .300 WM which was very anti social until he changedthe stock from wood to synthetic. A chap I know also had a deer legal .44 whichwas no fun to zero. Both of these calibres produce a fraction of the recoil ofthe big bores, but for some reason I didn’t get on with them.
    Mike

  10. #10
    One of the reasons I was asking is that when I took the dsc1 I used the basc rifle, a 6.5 x 55 Tikka T3. This was nice to shoot and easy to keep the sight picture when taking the shot.

    For many reasons I later got a .308 which I really like but the recoil is such that I can't keep the sight picture. Long story long..I'm thinking of getting a .308 load which equates to a 6.5 in recoil.

    Sorry .223, I'm hijacking the thread a bit but hopefully it's of interest.

    fraser

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