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Thread: How is it calculated?

  1. #1
    Boolit Buddy JLF's Avatar
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    How is it calculated?

    How do you calculate the length of the cast lead bullet to consider when choosing the right mold?
    "When the homeland is in danger, everything is allowed, except not to defend it."

    Gral. Don José de San Martin.

  2. #2
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    Winger Ed.'s Avatar
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    I don't.
    I look for the design/style I want and the weight of it.
    Loading data and the overall cartridge length will take care of the rest--- maybe with a little tweaking.

    For example:
    If I want a .30 caliber Round nose to use in a .30-30--
    Look at published loading data for the weight I want, then pick a mold.
    Which powder and how much of it is important----- the length of the boolit itself, doesn't really matter.


    This is all basically almost 200 year old technology, and what I call 'well plowed ground'.
    I try to avoid all the over thinking and hair splitting that is so easy to do.
    Last edited by Winger Ed.; 12-11-2022 at 12:09 PM.
    In school: We learn lessons, and are given tests.
    In life: We are given tests, and learn lessons.


    OK People. Enough of this idle chit-chat.
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    EVERYONE!
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  3. #3
    Boolit Master
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    The diameter of the bullet and the weight of the bullet determines the length.

  4. #4
    Boolit Master
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    Quote Originally Posted by Froogal View Post
    The diameter of the bullet and the weight of the bullet determines the length.
    Length Also determines what twist rate will stabilize it ??

  5. #5
    Boolit Master
    JSnover's Avatar
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    Quote Originally Posted by BLAHUT View Post
    Length Also determines what twist rate will stabilize it ??
    There's a formula for diameter, length, twist. It helps to know the intended velocity.
    Warning: I know Judo. If you force me to prove it I'll shoot you.

  6. #6
    Boolit Master

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    I think the Greenhill formula is what you were thinking of. It is an old formula and I believe it has been supplanted by a newer version. They are not 100% It might be quicker and more reliable to just ask specifically here as to what you need to do your job. I would be surprise if someone could help you.

  7. #7
    Boolit Buddy JLF's Avatar
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    Thank you very much for your help.
    "When the homeland is in danger, everything is allowed, except not to defend it."

    Gral. Don José de San Martin.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check