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.357 Sig Info to share

Discussion in 'Handloading and Reloading' started by RB98SS, Jan 31, 2010.

  1. RB98SS

    RB98SS Well-Known Member

    Edit: I should have noted earlier that my caliper was a bit off reading .3535 on the diameter of these bullets. I pulled my old Lyman dial caliper out and made some checks and adjusted the info below with the Lyman. Very little changed other than the COL is a hair over 1.140.

    I've recently started reloading 357 Sig and of the all the cartridges I've reloaded, this one was, and continues to be, somewhat of a more challenging round to do mainly because of the short neck of the cartridge. Not that it's all that difficult but more specifically finding a bullet that I feel comfortable loading with. I've received a bunch of info from members of this board as usual and am thankful, but nothing too specific regarding which bullets work and which don't.

    So, assuming any 357 Sig reloader already knows that any round nose NATO type bullet is out of the question, I'd like to share with you the bullets I have used and some information regarding them. Hopefully members here will be able to share the bullets that worked for them also.

    Below is a picture of 6 loaded rounds using different bullets that I have fired. From left to right; Montana Gold 124gr JHP, Hornady 124gr JHP, Zero 115gr JHP, Remington 124gr JHP, Buffalo Bore (factory) 125gr JHP, and finally, Berry's 124gr FP. All of the rounds are seated to 1.140 with the exception of the Berry's, it is seated at 1.120. I did not measure the max diameter of the Berry's or the Buffalo Bore bullets but the others measured .355 on my caliper.

    Here is some pertinent info that I thought might be useful to some of you, I tried getting it formatted to a table, but didn't have any luck so it's kind of busy info.

    The MG124 bullet is .578 in total length, and measured .355 at point "A"
    The HDY124 is .575 in length and measured .355 at point "A"
    The Z115 is .531 in length and measured .353 at point "A"
    The REM124 is .571 in length and measured .352 at point "A"
    The BB125 measured .348 at point "A"
    The BER124 measured .354 at point "A"

    Anyway, what does it all indicate? Nothing other than there appears to be sufficient neck tension on all of these bullets to work in the 357 Sig. Interesting to note that the smallest diameter at point "A" is the factory Buffalo Bore.

    Hope some of you find this worthwhile.

    Last edited: Jan 31, 2010
  2. JimKirk

    JimKirk Well-Known Member

    I have used the Speer 125 Gr Gold Dot with good results. They are hard to find.

    Jimmy K
  3. benzuncle

    benzuncle Well-Known Member

    Thanks for sharing the info. I am adding this to my 357SIG info pile. I would be interested in knowing which brass you are using and if more than one brand, if you have found any to more to your liking than other types of brass?
  4. RB98SS

    RB98SS Well-Known Member

    Actually, a while back I ordered 1000 pieces of once fired, so the headstamps are mixed. I've used them all, only thing I noticed is the flash holes are different size between stamps. I cant recall which were smaller or larger though, and it didn't pose any problems.

    Feel free to share your "info pile", I'd be glad to listen. :)
  5. benzuncle

    benzuncle Well-Known Member

    I have loaded the 125gr Montana Gold FMJ's and 124gr Hornady encapsulated flat nose bullets with very good success. They both measure .355. The 125gr Speer Gold HP's are labled as .355 but more often than not measure .356 and sometimes don't fit as easily as I have my setup arranged. The 124gr Hornady XTP's, also .355 and work very well. It is regrettable that Remington does not make a Golden Saber bullet for the 357SIG.
  6. JimKirk

    JimKirk Well-Known Member

    What kind of problem are you having with the Speers? I have never measured them to see what the diameter is. I'm out right now, so when I get some back in stock I'll measure them. I had good results with the Hornady xtp too. I do find that I have to chamfer the case mouths good. I've not had any set back problems with either, the GD's larger diameter may explain that.

    Jimmy K
  7. cmgred

    cmgred Well-Known Member

    MG has 125 gr. .357 SIG FMJ in stock. They work great!
  8. Otto

    Otto Well-Known Member

    Have you checked the setback? You can press the bullet against a bathroom scale to see if it can handle at least 40 lbs of pressure.
    I use Zero 125gr TC's which are specifically for the 357 Sig.
  9. RB98SS

    RB98SS Well-Known Member

    I have not checked with a scale, but I can tell you this. The loads I have made, have not "set back" any more than the Buffalo Bore or Remington factory rounds when I've chambered them in my Glock. So far from what I've learned, all 357 Sig rounds set back when the slide slams shut even with a good crimp. Just my observation.

    I know that Zero and MG make a bullet specifically for the Sig but they are not HP's and that is what I was looking to find. The information I provided is what worked for me but it's just that, Information. What anyone chooses to do with it is their prerogative.
  10. cmgred

    cmgred Well-Known Member

    RB98SS - Sorry I wasn't talking down in regard to the MG's. You are correct the MG's are flat points not JHPs.

    I just recently found them in stock and wanted folks to know they were available ( I had waited several months). Thank you for the information. That was a lot of work to do for folks.

    I've used the Rem124s, but I used a COL of 1.145 as that seemed to help with setback issues I was having, without impacting the action.
  11. RB98SS

    RB98SS Well-Known Member

    CM, no problem, I didn't think you were. Thanks for the info.
  12. benzuncle

    benzuncle Well-Known Member

    JimKirk, the Speer Gold dots don't fit in the casing all of the time. All of the other types of bullets fit fine with the casings expanded to where I have the expander die set. I have had no setback problems whatsoever. I do use AA#9 at 13gr, and this fills the casing and most likely prevents setback. I really love the round.
  13. JimKirk

    JimKirk Well-Known Member

    Ok, I was just making sure to watch out for any problems. So far, I have not had any problems with the Gd fitting my cases. I've only shot about 400, because I can't seem to find them any more. I have had good luck with Hornady XTP, they are easier for me to find. I shot over a 1000 of them with no problems. I'm shooting 13 grs. of #9 too, I tried a few at 13.5 grs. but backed down to 13grs., I've not had set back with either bullet. What dies are you using, I am using RCBS. I am watching this thread with interest! I need to find other bullets to shoot.

    Jimmy K
  14. RB98SS

    RB98SS Well-Known Member

    And that is why I posted this. It seemed that there was very little information as to what bullets had been successfully loaded other than the jacketed or plated flat points. Hopefully we will get more feedback. :)
  15. benzuncle

    benzuncle Well-Known Member

    Unless you need hollow points, there are 124/125gr 9mm bullets that will work very well in the 357SIG. I have already mentioned the Montana Gold Bullets and the 124gr Hornady encapsulated flat nose bullets. I found the Hornadys while browsing Midway; I came across reviews of customers that were using 9mm bullets for reloading 357SIG rounds.

    I use a Lee 40 cal. carbide die to size the cases and Lee's 357SIG dies for the rest. As per advice from others, I had a couple thousandths milled off the top of my shell holder to make the bottleneck portion of the casing conform. Wilson sells a case gauge for the 357SIG also.
  16. benzuncle

    benzuncle Well-Known Member

    JimKirk, I bought my first 500 casings for reloading from Georgia-Arms in the form of an ammo box with 500 rounds of 357SIG. This gave me something to shoot while getting my Lee Classic Turret Press set up for the reloading process. Their rounds are rated at 1300fps. Nice stuff.
  17. RB98SS

    RB98SS Well-Known Member


    Thanks for the information. As I mentioned earlier in the thread, I was looking for some options for HP bullets. Montana Gold makes a bullet specifically for the 357 Sig along with Zero, neither however, are HP's. It's also pretty common knowledge that the Berry's FP bullets work well too, and I haven't tried them, but I'm guessing that the Rainier FP's work as well.

    As far as what I read, the only HP's that worked were the Speer and Hornady's. Although these are fine bullets I was hoping to find a cheaper bulk alternative and that is why I tried these others. Specifically the Zero HP's, the Montana Gold HP's and the Remingtons. Have you tried the Rainiers?
  18. JimKirk

    JimKirk Well-Known Member

  19. JimKirk

    JimKirk Well-Known Member

    I Emailed Sierra yesterday and got this reply back today:

    Jimmy K

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