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Thread: Chronograph Data - 357 Magnum reloads and 38 Special +P factory

  1. #1
    Boolit Buddy Hi-Speed's Avatar
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    Chronograph Data - 357 Magnum reloads and 38 Special +P factory

    Date: June 15, 2022
    Place: Douglas County NV

    Handgun: Ruger Blackhawk 357 Magnum 4 5/8”
    10 shot strings (had no readings avg about 7 rds recorded per load)

    357 Magnum Reloads:

    Lyman 358477 (155 gr)
    6.5 grs Unique
    MV 1,051 fps
    ES 45

    Lyman 358429 (170 gr)
    6.0 grs Unique
    MV 958 fps
    ES 71
    Note: 1.553” OAL

    Lyman 358439 HP (160gr)
    11.0 grs Alliant 2400
    MV 1,176 fps
    ES 84
    Note: 1.553” OAL

    Speer 158 gr LSWCHP
    6.0 grs Unique
    MV 942 fps
    ES 62

    38-44 Reload:

    Lyman 358429 (170 gr)
    11.0 grs 2400
    MV 1,171 fps
    ES 42
    1.532” OAL

    Remington 38 Special +P 158 gr LHP (2018 manufacture)
    MV 904 fps
    ES 50

    Double Tap 38 Special + P 158 gr Cast SWC (2020 manufacture)
    MV 906 fps
    ES 42

    Was expecting more from both Remington and Double Tap 158 gr 38 Spl +P loads but then again they were tested out of a 357 magnum with its longer chambers…actual fps in a 38 Special chambered revolver may likely be 25 fps faster.
    Last edited by Hi-Speed; 06-20-2022 at 09:43 PM.

  2. #2
    Boolit Master

    pworley1's Avatar
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    The remington +p looks to be right on what the box predicts. The double tap do look to be a little below the predicted velocity.
    NRA Benefactor Member NRA Golden Eagle

  3. #3
    Boolit Master
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    I posted some Chrono data on the 44 Mag using 2400 quite some time ago and it was picked to pieces by the experts. I wonder if yours will be?

  4. #4
    Boolit Master


    Walks's Avatar
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    Those 1st 2 loads have been standard .357Mag Loads in My Family since before I was born, 1954. Ditto for the .38/44 load for S&W M27, Colt OP & SAA. Sent more of these loads down range then I can count.

    Thank You for reminding Me of the velocities that I was getting.
    I HATE auto-correct

    Happiness is a Warm GUN & more ammo to shoot in it.

    My Experience and My Opinion, are just that, Mine.

    SASS #375 Life

  5. #5
    Boolit Buddy Hi-Speed's Avatar
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    Quote Originally Posted by 44MAG#1 View Post
    I posted some Chrono data on the 44 Mag using 2400 quite some time ago and it was picked to pieces by the experts. I wonder if yours will be?
    I get tighter spreads when using 2400 in 38-44 loads and using the 358429 loaded “short” ( crimped over front edge of first driving band) in 357 cases. I have some new data from today’s chrono session using the 2400 and the 158 gr SWC (Magma mold) BNH 12 in 357 cases and will post under separate thread.

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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