Load Data for Sierra JSP 158 g (38 spcl/.357 magnum)


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Keeperfaith
November 8, 2012, 09:12 PM
Hello all, I just bought some Sierra JSP 158grain bullets for 38 special/357 magnum.

I got home and found no data for these bullets in my Lymans 49th or Lee manual.

Anyone have any load data for this bullet?? (preferably with HP-38/Win 231, Alliant 2400, or Accurate No.2 powder, Thats what I have).

Thanks in advance,

Steve

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oneounceload
November 8, 2012, 10:01 PM
If you have data for 158 JHP, it will work. I used to load a lot of those when they were cheap and my older Sierra manual has data, but it is many years old and not up with current powder blends

Hondo 60
November 8, 2012, 10:02 PM
If they were mine, I'd use the data for a 158 GR. HDY XTP.

Just start low & work up

ArchAngelCD
November 9, 2012, 01:28 AM
There you go, use JHP load data and crimp in the crimp groove.
You will get good results with W231/HP-38 in the .38 Special and 2400 in the .357 Magnum.

Steve C
November 9, 2012, 03:38 AM
Sierra 140gr and 158gr data for .38 & .357 mag form Loadbooks.

Sierra 158gr data .38 and .357 mag (https://www.dropbox.com/s/9vfis8relt9s6jk/158gr38_357Sierra.PDF)

Mr.Revolverguy
November 9, 2012, 08:31 AM
Sierra says

w231 7.0-7.7
AA#2 6.6-7.5
2400 14-15

AA#7 being the most accurate load 11.4gr

bds
November 9, 2012, 10:48 AM
Load Data for Sierra JSP 158 g (38 spcl/.357 magnum)

preferably with HP-38/Win 231, Alliant 2400, or Accurate No.2 powder
Current Alliant load data (http://www.alliantpowder.com/reloaders/powderlist.aspx?type=1&powderid=9&cartridge=28)
357 Magnum 158 gr Speer GDHP 2400 OAL 1.575" Barrel length 10" Max 14.8 gr 1,265 fps


From 2004 Alliant load data (glarp.atk.com/2004/2004Catalogs/2004AlliantPowderSM.pdf)

http://www.thehighroad.org/attachment.php?attachmentid=174434&stc=1&d=1352472360


Here's current Hodgdon load data (http://data.hodgdon.com/cartridge_load.asp)
.38 Special
158 gr Hornady XTP W231/HP-38 .357" OAL 1.455" Start 3.8 gr (661 fps) 12,600 CUP - Max 4.3 gr (779 fps) 15,900 CUP

.357 Magnum
158 gr Hornady XTP W231/HP-38 .357" OAL 1.580" Start 6.2 gr (1108 fps) 33,700 CUP - 6.9 gr (1220 fps) 40,000 CUP


From 1999 Winchester load data (http://www.thehighroad.org/attachment.php?attachmentid=159609&stc=1&d=1329800605)

http://www.thehighroad.org/attachment.php?attachmentid=174433&stc=1&d=1352472329

ArchAngelCD
November 10, 2012, 01:45 AM
Sierra 140gr and 158gr data for .38 & .357 mag form Loadbooks.

Sierra 158gr data .38 and .357 mag (https://www.dropbox.com/s/9vfis8relt9s6jk/158gr38_357Sierra.PDF)
Can you tell me what year that Sierra load data is from?

41 Mag
November 10, 2012, 06:02 AM
Usually, but not always, with any given bullet weight, if you have listed data for that particular weight, you can cross reference, and substitute another bullet of the same weight using that data.

The kicker is, some of the newer copper bullets like Barnes, the Hornady XTP, and some variations of cast. The issues with the jacketed or solid type are that the XTP has a harder core and jacket than other standard cup and core JHP's, and the Barnes, well being solid, these types will bump up the pressures due to their resisting the rifling a bit more than a standard C&C type bullet.

With the cast bullets, it all depends on the particular dimensions of the bullet. They can have a longer base on them, which when seated consumes more of the case than a similar weight jacketed, and therefore will raise pressures. Hardly any cast bullet will be as hard as a jacketed, and IF the shank, or base below the crimp groove, are close to or the same as what is found on a jacketed of similar weight the same STARTING LOAD DATA can usually be used to work up loads for them as well, depending on the BHN. If the bullet has a low BHN (6-10), velocities need to be kept low @ 1100fps or less, but most anything above a 12-14 BHN can usually be driven to mag velocities depending on the fit of the bullets to the particular bore of the firearm. Usually with standard weight for caliber cast bullets this is the case, however with some of the now popular copper plated bullets, even if the hardness is there, they should not be pushed much if any over around 1100fps due to the copper plating being stripped off the lead.

The last thing would be that faster powders jump up pressures more quickly and can in some cases ruin an otherwise good load or worse, where the mid ranged and slower powders might not be quite a clean burning, but they are MUCH more forgiving when working with a new load. The exception would be H-110/296 where the reducing loads are not recommended.

KevinR
November 10, 2012, 04:48 PM
14.8 GR 2400 / WSP / 158 Gr Sierra JSP / No Crimp / 1.59OAL / 1700FPS / H&R Single Shot Rifle
(Use with caution!!) Lyman Lists this as a MAX Load and it is. Burning holes in about 10% of primers. But it is a Deer Load so I don't go through many of them.

Steve C
November 19, 2012, 03:12 AM
Can you tell me what year that Sierra load data is from?

The Loadbook was published in 1993.

gamestalker
November 20, 2012, 03:08 PM
Mr. Revolverguy's Sierra data is consistent with my Sierra data that is from 2002, so your good to go.

And if you are loading with a simular bullet of different jacketed bullet make, but all else is the same, it is generally OK to use existing data to cross refrence from, I do it from time to time without problems.

GS

SSN Vet
November 21, 2012, 05:37 PM
w231 7.0-7.7

I can tell you with a great deal of certainty that you will NOT like this load...

Try it and you will learn the definition of SNAPPY first hand.... and then proceed to rub the palm of your shooting
hand.

14 gr of A2400 is becoming one of my favs

Miata Mike
November 22, 2012, 12:21 AM
I found using 2400 powder to be very satisfying. Neat fire ball too if I remember right.

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