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Does 100 fps mean much?

Discussion in 'Shooting Related Threads' started by blkcloud, May 4, 2010.

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  1. blkcloud

    blkcloud Active Member

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    I'm loading 7/8 oz aa's at 1150 fps, I have some factroy remingtons 7/8 oz that say 1250 fps on the box, can you tell the difference between the two in the lead on hard right or hard left targets? thanks!
     
  2. KEYBEAR

    KEYBEAR Active Member

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    Means you can,t out run it .
     
  3. Unknown1

    Unknown1 Well-Known Member

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    Not really...

    Assume:<UL><LI>target leaves the house at 40 mph and slows to 30 mph (44 ft/sec, 528 in/sec) by 40 yards out
    <li>shot leaving the muzzle at 1150 slows to 800 ft/sec at 40 yards out and takes ±.15 sec to reach the target
    <LI>shot leaving the muzzle at 1250 slows to 825 ft/sec at 40 yards out and takes ±.145 sec to reach the target--difference of ±.005 sec
    <LI>the target traveling 528 in/sec will have traveled about 2 inches (about half its diameter) in that .005 sec difference</UL>

    The only very slight advantage that the additional 100 fps might bring is in retained energy at the target, but #7-1/2 launched at 1200 fps has 1.3 ft.lbs of energy left at 40 yards while #8 shot retains a mere 1 ft.lb. The addition/subtraction of 20 fps is of minute consequence.



    MK
     
  4. blkcloud

    blkcloud Active Member

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    Thanks! That's what I was looking for!
     
  5. Mark425

    Mark425 TS Member

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  6. OLD ONE EYE

    OLD ONE EYE Well-Known Member

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    I do not think it is a big deal from 1150 to 1250 but I would not like anything slower than 1150. With the lighter load recoil is less so I have stuck with the 1250 and tightened up on my choke and am very happy with my reloads the thing I feel it is more important is to shoot the same load consistantly the less you change the better your timing will be over time.
     
  7. phirel

    phirel TS Member

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    Just a little more speed makes no difference unless you are driving through radar. In a 65 MPH zone, the difference between 70 MPH and 71 MPH is about $100.

    Pat Ireland
     
  8. hmb

    hmb Well-Known Member

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    The faster it starts out the faster it slows down. HMB
     
  9. grnberetcj

    grnberetcj Active Member

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    Think kinetics not speed!

    Curt
     
  10. shannon391

    shannon391 Active Member

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    From the 27, I can feel the difference of the speed.
     
  11. Rich219

    Rich219 Active Member

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    I've been shooting a load at 1250fps since I started about 8 months ago and have noticed that after about 100 shots my shoulder starts to get tired. I tried a new load today at 1150 fps and after 150 rounds straight my shoulder was not tired. Obviously this has nothing to do with leads but using the same leads I use for the 1250 fps load my scores were identical. In my personal situation I think 1150 fps works better overall for me and I'll be switching my 16yd load to this from here on out.
     
  12. highflyer

    highflyer TS Member

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    When you run the math it makes no difference. When you are shooting the faster loads you can feel a little difference and you can see a difference in how the targets break.
     
  13. dverna

    dverna Active Member

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    Much better to have 1 1/8 oz at 1150 than 1 oz at 1250.

    Don Verna
     
  14. hunter44

    hunter44 Well-Known Member

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    The 100 FPS makes a lot more difference at the shoulder than at the target!
     
  15. highflyer

    highflyer TS Member

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    If speed makes no difference why stop at 1150. Following the same logic wouldn't most shooters do better with 1050.
     
  16. Rich219

    Rich219 Active Member

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    " If speed makes no difference why stop at 1150. Following the same logic wouldn't most shooters do better with 1050. "

    I don't think anyone is saying that speed makes no difference, just that the difference between 1250 to 1150 fps is minimal to the point where it doesn't make a difference.

    Why stop at 1050? Why not shoot at 50fps?


    rich219_2009_25088.jpg


    These figures are based on a constant speed.
     
  17. pheasantsgalore

    pheasantsgalore Active Member

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    Only in baseball !!!!!!!
    Rob
     
  18. phirel

    phirel TS Member

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    Rich219- You indicated that your graph was based on constant speed, but both the target and the shot slow down significantly during flight.

    Curt- How is it possible to separate kinetics from speed?

    Pat Ireland
     
  19. grnberetcj

    grnberetcj Active Member

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    Pat...

    You read too much into it.

    If the correct speed and load size are matched properly, then the kinetic striking power of the pattern will be maximized.

    There are as many variables as there are powders. Each will have it's own "match".

    Better now?

    Curt
     
  20. phirel

    phirel TS Member

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    Curt- The kinetic energy depends on the weight of the shot and the speed of the shot. Kinetic energy is the energy of motion. I do not understand the term "kinetic striking power of the pattern". If you are indeed referring to the number of shot hitting the target and the total energy transfered to the target (eg. two #8 shot transfer more total energy than one #7.5 shot), I would agree with you.

    Matching different loads to get the best pattern is a very complicated process. From what I have measured, the variation in patterns from one load can frequently be as great as the variations between two different loads.

    Pat Ireland
     
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