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2400 in 357 SIG

Discussion in 'Handloading and Reloading' started by kcofohio, Sep 29, 2021.

  1. kcofohio
    • Contributing Member

    kcofohio Contributing Member

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    Some time back I noticed that the 357 SIG case has more capacity than the 38 Super. Then I seen that Alliant list a load using 2400 in 38 Super using a 147 gr. bullet. So the curious squirrel cage started whirling. Comparing 357 SIG vs. 38 Super using AA#9, which was the closest comparison I could find. Per Lee's VMD chart, 2400 is .0742 and AA#9 is .0657. So 2400 will fill the case and become compressed faster. AA#9 max in 357 SIG with XTP is 10.5 gr. compressed. 38 Super max is 10.7 gr. Alliant list a generic 147 gr. JHP in 38 Super max as 10.9 gr.

    This is not an attempt to find an end all load. But merely an exercise to see what works. As I have plenty of 2400 and 300-MP for 357 mag.

    Use with caution and understand, that this is an unpublished load. And in doing so, without any pressure test, the user of this data accepts full responsibility of any possible adverse effects.

    Using a RMR 147 gr. Match Winner bullet, I worked up from 9.9 gr. to 10.7 gr. using 2400. RMR's 147 gr. is about .005" shorter than Hornady's 147 gr. XTP. The top loads are compressed. Winchester WSP primers were used. After reloading them, I realized that the 357 bullet is seated deeper (I believe by about .080") than the 38. My goal is to see which load would make between 1150-1200 fps.

    So my plan was to get some velocity readings today. But for that one thing I always forget, today it was the tripod. And I couldn't get a good stack off a barrel at the range for a good chrony setup. So I shot the 1st 2 loads, 9.9gr. and 10.1 gr. No sign of primer flattening. The POI was the same as the 147 gr. XTP with 7.2 gr. of Longshot. About 1" to the right of the bullseye at 11 paces. Longshot was throwing the cases a couple feet further away. Without velocity readings, I won't go any higher. I want to make sure nothing erratic is happening.
     
    WrongHanded likes this.
  2. AJC1

    AJC1 Member

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    If there is a #9 load which is slower I could follow that 2400 would work. 2400 has tons of utility and is used a lot like unique. Good that your managing risk.....
     
    kcofohio likes this.
  3. Ranger99

    Ranger99 Member

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    Maybe contacting Alliant would bear
    some fruit
     
  4. Lennyjoe

    Lennyjoe Member

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    Interested as I have 2400 sitting on the shelf and 147’s ready to load. I’m currently working up a Blue Dot load now but haven’t gotten to the range yet.

    183D8D20-D9BF-43D1-87FE-069B9E499CD8.jpeg
     
    kcofohio likes this.
  5. kcofohio
    • Contributing Member

    kcofohio Contributing Member

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    I have one bottle of Blue Dot, but haven't tried it in 357 SIG yet. IIRC, I've only tried it in 40 S&W.

    I'm surprised that Hornady doesn't have AA#9 or Longshot in their data.
     
  6. AJC1

    AJC1 Member

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    #9 is really slow... I got 3 lbs and wished I had some #7 insted.
     
    kcofohio likes this.
  7. JimKirk

    JimKirk Member

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    I have shot Blue Dot in my 357 SIG.... but not 2400 .... have seen data for W296 but have not tried it either...

    800x is(would be I should say) my favorite .....that is if it would meter worth a hoot....
     
    Bfh_auto and kcofohio like this.
  8. Lennyjoe

    Lennyjoe Member

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    I still have several lbs of 800X that I use in 10MM. Haven’t tried in .357 Sig yet. I use my FA Intellidropper for 800X. It’s a slow process but gets the job done.
     
    JimKirk likes this.
  9. kcofohio
    • Contributing Member

    kcofohio Contributing Member

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    I came across this site recently. The show a couple loads for H110(W296).
    I have used a little of 800x. They are some big flakes. It worked well and seems to burn up well. But I don't mind taking it slow with this cartridge.

    Oops! Forgot to post the link.
    https://reloadammo.com/reloading-357-sig/
     
    Last edited: Oct 1, 2021
    JimKirk and Lennyjoe like this.
  10. vaalpens

    vaalpens Member

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    I have tried a few different loads with the RMR 147gr bullet and 357sig, and found CFE Pistol to be very accurate. It has a similar VMD (0.0754) as 2400, but it is obviously a faster powder. I have not tried 2400 or W296.

    Following are two different loads I tested with CFE Pistol. The 5.5gr load probably gives me more consistent grouping results, but both are good:

    357sig, P229, 3.9"
    Case: Speer
    COL: 1.140"
    RMR, 147gr, TCFPMW, CFEpistol, 6gr, CCI500
    Average: 1064
    ES: 19
    SD: 7.4
    Force: 369
    PF: 156
    Velocities: 1065, 1057, 1059, 1076, 1064
    Grouping @ 15yd: 0.5"
    Test Date: 11/20/2018

    357sig, P229, 3.9"
    Case: Speer
    COL: 1.140"
    RMR, 147gr, TCFPMW, CFEpistol, 5.5gr, FED100M
    Average: 975
    ES: 87
    SD: 34
    Force: 310
    PF: 143
    Velocities: 1003, 983, 986, 988, 916
    Grouping @ 15yd: 0.51"
    Test Date: 11/01/2020
     
  11. kcofohio
    • Contributing Member

    kcofohio Contributing Member

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    From your post many moons ago, I tested a batch of CFE-E with the 147 gr. MWs. @ 6.1 gr. They shot well enough, and at some time I'll load more.

    The 2400 loads are an experiment for me. I guess a lot of reloading is an experiment. :D
     
    Lennyjoe and AJC1 like this.
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