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Thread: 5.5mm pellet weight and length vs stability

  1. #1
    Sharp Shooter

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    Default 5.5mm pellet weight and length vs stability

    I'm always interested in pushing the limits of my spa m10. It's over engineerd design lends well to pushing boundaries in terms of tuning and shooting heavier lead. My biggest question is what is the largest piece of lead someone has shoot through their air rifle and how did it perform in terms of stability obviously we are limited by the bore size so the extra weight will have to be put behind the pellet to increase the weight . (Eunjin 32.4 are the heaviest I have tried)
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  2. #2
    Sharp Shooter
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    Peat on this forum is experimenting with different weight, lengths of all calibres. Give him a call and chat to him. He is very interesting to listen to.
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  3. #3
    Sharp Shooter

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    Hi kareemello,

    Your question: What do you think would be the biggest 5.5mm pellet you could make that will be effective and stable?

    Now that is the Million Dollar question?

    Quick answer, I don't know yet?

    Here is what I do know. In our quest for more knockdown power and the ability to shoot beyond the 100m mark with heavier projectiles and more power, and greater accuracy, and flatter trajectory's, we encounter the following problems.
    Beyond a certain weight, ( I'm not yet sure what that weight is, but it is >30 grn), more stability needs to be introduced into the equation, by increasing the spin on the projectile.
    This means a new barrel. So without changing your barrel, there is logical a perfect pellet.
    Aerodynamically, what should the perfect pellet look like? The Diabolo shape has been around for ever, and is still the best.
    Now JSB's are my benchmark, followed by Sam Yang and Eunjin.
    So in my quest to find the ultimate pellet I have made hundreds of .20 and 5.5mm pellets, note, they are not Diabolo shapes.



    .20 casting and swaging dies.



    This is the latest shape I'm experimenting with.

    I have sorted out the power, but the stability still eludes me.........



    5.5mm HM Pellets shot through aluminium 6082 T6 3.2mm plate



    5.5mm HM Pellets shot through aluminium 6082 T6 3.2mm plate, another view. The power of my Gunpower Stealth still fascinates me. I can still get more out of it but decided to stop here.

    But maybe we are doing it all wrong!! Have a look at this

    Acceptable accuracy ~ Air Rifle SA Forums
    Last edited by Peat; 09-02-15 at 10:32.
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  4. #4
    Inactive Member

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    Years ago when I shot black powder I learnt the importance of length vs width vs twist rate. Especialy on large bore. Pellet guns seem more drawn to those principals vs nitro so those 3 things influence accuracy but are seldom spoken of.
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  5. #5
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    my dear

    How much for one of these mold sets5.5mm (.22cal)

    .20 casting and swaging dies
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  6. #6
    Prof. Jan Itor

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    Quote Originally Posted by abusaad1387 View Post
    my dear

    How much for one of these mold sets5.5mm (.22cal)

    .20 casting and swaging dies
    Ships worldwide:

    Homemade airgun pellets,Make your own air gun pellets,airgun pellets
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