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Thread: .357 SIG

  1. #1
    Site Supporter CCT125US's Avatar
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    Apr 2011
    Location
    Ohio

    .357 SIG

    • Reloading press used (list modifications if relevant): Dillon 650
    • Caliber: .357 SIG
    • Bullet (Weight, Coating, Profile, Manufacturer): RMR 124gr JHP MPR
    • Powder manufacturer, type and charge; volume, type (ball, stick, flake):Unique
    • Dies used:Hornady decapper, Dillon powder through expander, Hornady seater
    • Primers used:CCI500 SPP
    • Cartridge Overall Length (COAL):1.150
    • Chronograph data (if possible):
    • Goals intended with this load:Accurate plinking round
    • Results - accuracy, smokiness, clean burning, flash, temperature, smell, brass deformation, etc.:
    • Problems encountered and fixes applied:Worked through some initial bullet setback issues through multiple chambering. Adjusted the powder through expander and the seat / crimp die to mitigate.
    • Anything of interest:


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  2. #2
    LEE makes a collet type "Factory Crimp Die" that should help you with your bullet setback. This is a spinoff of their rifle FCDs. I bought one, and it fixed that issue for me with the first use.
    Malo periculosam, libertatem quam quietam servitutem
    I prefer the tumult of liberty to the quiet of servitude
    -Thomas Jefferson
    I prefer dangerous freedom over peaceful slavery.

  3. #3
    Site Supporter CCT125US's Avatar
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    Apr 2011
    Location
    Ohio
    Info above using 6.5 gr Unique
    P2000 .357
    RMR 124gr MPR JHP

    Velocity and setback testing

    Measured starting OAL, re-measured after several strings:

    1.151, 1152 fps
    1.151, 1164 fps
    1.151, 1146 fps
    1.151, 1135 fps
    1.150, 1150 fps
    1.150, 1.144, 1175 fps
    1.149, 1.150, 1158 fps
    1.149, 1.146, 1146 fps
    1.149, 1.150, 1.143, 1150 fps
    1.149, 1.148, 1.146, 1162 fps
    1.148, 1.148, 1.148, 1139 fps
    1.145, 1.143 1.141 1165 fps

    SD: 11.6 pleased with this.

    Sharpied OAL on case, fired 5, measured the remaining rounds, loaded mag in same order, fired 3, measured remaining rounds.

    Pleased with initial batch. A bit mild, but no noticeable bullet pull / setback under recoil.

    Sellier and Bellot 140gr FMJ chrono:
    1212
    1221
    1228
    1230
    1230
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