2400 powder mag primers or not??

Discussion in 'Handloading and Reloading' started by Encoreman, Feb 27, 2021.

  1. Encoreman

    Encoreman Member

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    Hi all, have several reloading manuals. The Speer say use a magnum primer with 2400 in .357. I see that Alliant website says cci500 which is regular SPP. I loaded and shot some with Fed SPP and noticed unburnt powder and the speed wasn't near the book. I have searched and read and half say don't need or use a mag primer the other half says to use mag primer. All help appreciated. Thanks Mac
     
  2. bluetopper

    bluetopper Member

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    Either with or without a magnum primer using 2400 will work fine as long as the powder charge is not too light. I personally don't use magnum primers with 2400. I see no need in it. Non-magnum primers have been used with 2400 powder since the 1930's.
     
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  3. 243winxb

    243winxb Member

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    Use less powder with some lots of 2400 , when using a magnum primer. http://castboolits.gunloads.com/showthread.php?381165-Test-of-Hercules-vs-Alliant-2400-in-the-357-Magnum-with-6-different-primers

    I have changed to WSPM to reduce pierced primers. Standard primers may have thinner cups.

    View attachment 980982

    More - https://www.thehighroad.org/index.php?threads/357-standard-vs-mag-primer-test.820296/

    Use whatever primer you can find these day. Good luck with that. :evil:
     
    Last edited: Feb 27, 2021
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  4. fxvr5

    fxvr5 Member

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    Speer says in their 14th loading manual to NOT use magnum primers with 2400 in the 357 with their load data.

    Which Speer manual do you have that says to use magnum primers?
     
  5. Herman B

    Herman B Member

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    I've used both standard and mag primers. Nosler, Hornady and Sierra recommend mag primers with 2400

    I doubt their text explicitly states 'do not use magnum primers'. One cannnot infer a negative corollary from a positive statement.
     
  6. mio

    mio Member

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    My Speer 13 only lists the silhouette loads needing the 550 magnum primer with the 2400 powder.
     
  7. fxvr5

    fxvr5 Member

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    In fact, their text DOES EXPLICITLY STATE the following:

    From Manual #14, page 892:

    "Do not use magnum primers with the 2400 or VihtaVuori N110 loads shown here or high pressures will result."

    Do Nosler, Hornady and Sierra specifically recommend mag primers with 2400? Or is a magnum primer simply what they use for all their 357 Data? Maybe you have inferred too much. I Just checked the Hornady manual #10. They do NOT specifically recommend magnum primers for 2400. They use a mag primers as their default primer for all their 357 data.
     
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  8. fxvr5

    fxvr5 Member

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    They list a CCI 500 primer with 2400 and the silhouette loads in the 14th manual.
     
  9. AJC1

    AJC1 Member

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    My opinion is that magnum primers are not required but may help in combustion when using liter projectiles and liter loads. When I shoot 180s with full power loads out of my 357 levers I dont have any unburnt powder. The same is true with 158s in my pistol. Crimps and temperature are big factors along with full charges.
     
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  10. Herman B

    Herman B Member

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    Thanks for that text - good to know.
    Right, a mag primer is their go-to primer across the board.
     
  11. bullseye308

    bullseye308 Member

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    I loaded one pound of 2400 in 357 with 180 grain flat points at max load a few years back and used cci 500’s. No problems with unburnt powder and my GP-100 was no dirtier than target loads using Bullseye. The primers were fine and showed no different signs than my regular loads.
     
  12. Charlie98

    Charlie98 Member

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    That's my opinion as well. I've not worked with 2400 a whole bunch, but it doesn't really behave itself until you near a compressed charge... much like IMR4227. I don't use a Magnum primer with either. Lighter charges... even with heavier bullets... did not give me consistent numbers, or a very good burn.
     
  13. Kevin Rohrer

    Kevin Rohrer Member

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    I did not use magnum primers when I used 2400.

    Anecdote: I used to load .357 mag cartridges using 2400. Unfortunately, the gun I was using was 2 1/2" Mod-19. When I fired it, a sheet of flame came out the barrel at least 3-feet long from all the unburned powder igniting when it left the barrel. Never fired the gun after dark, but if I had, it would have been impressive. :evil:
     
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  14. Encoreman

    Encoreman Member

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    I am fairly sure the Speer manual is #12. A friend told me about 2400 and just a few weeks after I found some at a LGS, so I scarfed it up, upon looking in my reloading manual it said * use magnum primer. I asked him he said he didn't. I loaded up a half dozen with Federal SPP and shot them over my chrono, not close to what the book said and looked like half the powder didn't burn. I don't have any small pistol magnum primers, but I do have the stupid Remington 61/2 small rifle primers that were made for 22 hornet, I tried them with the same powder charge and got much closer to book speeds and less unburnt powder. These are the kind of things that give new reloaders fits. I have been loading since about 1994, and with this manual saying use a magnum primer, the next saying don't use one. Thanks for all the replies.
     
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  15. Patocazador

    Patocazador Member

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    Yes with ball powder .. IF you have them.
     
  16. Walkalong

    Walkalong Moderator Staff Member

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    I don't use mag primers with 2400 in .357 Mag.
     
  17. AJC1

    AJC1 Member

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    What bullet what load which gun, how much crimp. These all matter. It's a magnum powder just like h110 and 4227. They can be a little fussy unlike faster pistol powders.
     
  18. Barbaroja

    Barbaroja Member

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    Just standard primers for me when I load 2400. What is your barrel length compared to the barrel used to produce the data?
     
  19. hdbiker

    hdbiker Member

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    NO, use Winchester primers and your good to go hdbiker
     
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