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Thread: .500 S&W -Ideal Rate of Twist for which Bullet Weights?

  1. 09-17-2011, 11:12 AM #1
    LEADLUBBER
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    .500 S&W -Ideal Rate of Twist for which Bullet Weights?

    Hello All,


    I am thinking about a custom gun .500 S&W project with a 16 inch barrel, but, I don't know what rate of twist will work best for me.


    I found a barrel blank with a 1:19 rate of twist, but, I don't know what weight of bullets will be best stabilized by that twist rate.

    I would like to be able to buy and use cast bullets through the barrel, and I think the 440 grain LEE mold is one of the few available for the .500 S&W.

    Thanks for the advice in advance!!!
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  2. 09-17-2011, 01:03 PM #2
    Nobade
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    1:19 is pretty steep. 50 BMG uses 1:15 and it'll easily stabilize 1000gr. cast boolits. My muzzleloader is 1:28 and shoots 500gr. S&W boolits just fine. I guess it'll depend on how heavy you want to shoot, but for normal weight S&W boolits even 1:32 should be plenty fast.
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  3. 09-24-2011, 10:05 AM #3
    DCM
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    Look at this to help determine what you need.
    http://castboolits.gunloads.com/show...ght=twist+rate
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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