Your favorite 357SIG powder

[King Medallion]

Just wondering what the works best for you. I am shooting a Sig 1911 Nightmare Fastback. Bullets tested is RMR 147gr JFN. So far my gun seems to favor HS-6, Universal, Power Pistol, and 800x, in that order. Did not like Tite Group or Unique. The RMR 124gr JFN bullets did best with 800x and oddly, Unique. I've decided the Berry's 124gr RN bullets are not suited well for this caliber, and accuracy sucked. Haven't tried any other bullets.

 

[Misplacedtexan]

Accurate #9

 

[Hartkopf]

Just thinking out loud but how would Longshot do? If a person were pushing 9mm to the moon, you run out of case volume. With the case volume of a 357Sig, it might be a good fit. Hodgdon’s load data looks promising.

 

[MAUSER88]

Blue Dot for me.

 

[kalielkslayer]

If you’re searching purely for velocity, I would look at Hartkopf’s recommendation.

For a clean burning powder I would recommend you try Silhouette.

 

[Big Wes]

AA #9 for me

 

[kerreckt]

Longshot works for me. I have used others but not as much.

 

[vaalpens]

For accuracy with the RMR 147gr bullet, I like CFE Pistol:

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

 

[vaalpens]

The RMR 124gr JFN bullets did best with 800x and oddly, Unique.

I also can't explain it, but the 124gr RMR MW bullet is very accurate with Unique:
357sig, P229, 3.9"
Case: Speer
COL: 1.140"
RMR, 124gr, TCFPMW, Unique, 7.1gr, CCI500
Average: 1254
ES: 18
SD: 8.1
Force: 433
PF: 155
Velocities: 1254, 1265, 1247, 1247, 1261
Grouping @ 15yd: 0.478"
Test Date: 10/08/2017

 

[WrongHanded]

BE-86. Followed by Power Pistol. But I haven't tried anything else because those two get it done for me.

 

[Lennyjoe]

800X, Longshot and BE-86 so far.

 

[blackhawk44]

Handloader magazine, Oct/Nov 2021, Pet Loads, 357 Sig should answer all of your questions.

 

[Lennyjoe]

Handloader magazine, Oct/Nov 2021, Pet Loads, 357 Sig should answer all of your questions.

Goa link to it? Maybe a copy to share….

 

[kcofohio]

Goa link to it? Maybe a copy to share….

Not quite from Handloader magazine;
https://reloadammo.com/reloading-357-sig/
https://shootersreference.com/reloadingdata/357-sig/

 

[vaalpens]

I've decided the Berry's 124gr RN bullets are not suited well for this caliber, and accuracy sucked.

RN bullets normally does not work in 357sig. Hopefully you are doing your due diligence by loading dummy rounds first, doing a plunk test, and test for setback. Also at least verify that the bullet ogive is outside/above the case neck.

The only Berry's plated bullet that worked ok for me was the 9mm 124gr Hollow Base Flat Point Thick Plate bullet. For plated bullets you always have to make sure your velocities stay below the max for the plated bullets. Normally 147gr plated bullets are better since you have lower velocities.

 

[ss30378]

I shoot sig from a 1911 as well, mine being a ruger sr1911 with a fusion 5" barrel. I throated my barrel to take advantage of the longer 10mm mag length and be able to run the heavier bullets seated out to 1.275" COL. For lighter bullets (125g and less) I like power pistol best but aa9 does very well, with heavy bullets (up to 180g) blue dot and 2400 have done very well. Plated bullets have not performed well for me in the sig so I stick with jacketed or hard cast.

 

[King Medallion]

RN bullets normally does not work in 357sig. Hopefully you are doing your due diligence by loading dummy rounds first, doing a plunk test, and test for setback. Also at least verify that the bullet ogive is outside/above the case neck.

Never done a plunk test, at least not on this gun, did on my Sig 229. Did do all the rest, did take a bit of fiddle to get the dies all set up good.

 

[King Medallion]

Handloader magazine, Oct/Nov 2021, Pet Loads, 357 Sig should answer all of your questions.

Happen to have that issue here in the pile, Thank you!

 

[Lennyjoe]

Like seeing 800X pushing a 147 grain XTP over 1300 fps but it wasn’t very accurate out of my G32.