.357 Sig Data

Here's a couple slow powder references.
6" G20 conversion barrel throated to allow max oal of 10mm mag. Do not reduce oal!!! .426 case head expansion on 2400 load .425 on 300mp

158gr berrys php, 11.5gr Alliant 2400 @ 1.270" = 1479fps

158gr berrys php, 14.0gr Alliant 300mp @ 1.270" = 1357fps

300mp load makes a huge fireball!!!

 

Same gun as above:

158gr berrys php, 14.5gr Alliant 300mp @ 1.280" = 1405fps (max compressed cannot go higher, .426 case head)

158gr berrys php, 9.0gr Win 572 @ 1.260" = 1447fps (pressure high, absolute max at this oal .427 case head!!!)

125gr xtreme plated, 16.0gr Alliant 300mp @ 1.260" = 1265fps (massive blast and flash similar to 50 cal desert eagle, powder way too slow for this combo but looks cool at the range. .423 case head so very low pressure)

 

G20 long slide, 6" throated lw barrel.

800x heavy bullet test...

Imr 800x powder

180gr Missouri bullet pugnose, powder coated version. .359 diameter

1.270" length
CCI 500 primer
Once fired Speer brass

8.5g = 1353fps, 731lbs, .426 case head
9.0g = 1395fps, 777lbs, .4265 case head
9.5g = 1486fps, 882lbs, .427 case head

These are some serious hunting loads! Accuracy got better as the charge went up.
Serious fire power from an autoloader!!!

 

A couple more 125gr additions:
6" lw g20 barrel throated for long loading

Both loads had:
Speer brass
125gr xtreme plated fp
1.275" COAL
CCI 500

18.0g Alliant power pro 300mp (max I could fit with max compression):
Avg 1551fps, .425 case head
More flash and boom than my 240g 454 casull load!

11.0g power pistol (max load!!!):
Avg 1720fps, .427 case head
Loud, good flash but nothing like the 300mp!

 

Thanks for sharing your data. Do you hunt hogs with 357 Sig?

 

Pigs, deer, coyote or just have it on me for woods defense. Its a fun round to work loads up for and to shoot.

 

Time for some barn burners...

Don't attempt to replicate these loads without careful workups!!!

G20 longslide, 6" LW

90xtp
1.190" oal
Speer brass
CCI 500
Power pistol

11.5g = 1891fps/714lbs .425 casehead
12.0g = 1956fps/764lbs .425 casehead
12.5g = 1990fps/791lbs .426 casehead

 

Addition to the data above:

13.0g = 2051fps/840lbs .4265 casehead

 

I'll make a quick note on this load. I ran these numbers on a cool 46 degree morning.

I re-ran these in 84 degrees today and they ran

2119fps/897lbs with a .427 casehead!

 

Some 5" 1911 sig numbers
Gun: Ruger sr1911 with fusion firearms 5" 357sig barrel
24lb recoil spring, flat bottom fps, 34lb mainspring.

As always please work loads up in easch individual gun!

90xtp, 13.0g power pistol 1.190" OAL
1926fps, 741lbs energy, .425 case head

125xtp, 17.0g 300mp, 1.250" OAL
1440fps, 575lbs energy, .423 case head

158php, 11.5g 2400, 1.250" OAL
1374fps, 662lbs energy, .425 case head

158gr swc, 12.0g 2400, 1.250" OAL
1511fps, 800lbs energy, .425 case head

180gr wfn, 10.0g 2400, 1.250" OAL
1331fps, 708lbs energy, .425 case head

180gr wfn, 11.0g 2400, 1.250" OAL
1422fps, 808lbs energy, .4265 case head

180gr wfn, 9.5g 800x, 1.250" OAL
1460fps, 851lbs energy, .427 case head
(Blowing primers at this level!!! Reduce!)

 

P

It’s pretty amazing what can be done with that cartridge. I don’t reload but thanks for sharing. What is the recoil like with the heavier/faster loads?

 

None of the loads above recoil very hard. The heavy 180s have the most thrust but are still easy to manage. Cases fly about 4-5 feet at the max loads. With the lighter slugs like the 90s and 125s cases only fly around 3 feet at full steam. Compared to the 10mm the 357sig 180gr max loads have less push than a 220gr 10mm at 1200fps.

 

I read your posts on page 4 of this thread, so I understand you are loading the cartridges long and using a 357 Sig barrel that has been throated in a Glock 20. But are there any issues using a .357 or .358 bullet in a 357 Sig barrel?

 

No issues, i run 357 bullets in all my 9mm bore barrels. I usually find them to be more accurate than 9mm spec bullets. Just work up loads for each bullet and you wont have issues.

 

As long as the ogive of the bullet has clearance to the lands, that is NOT jammed into the lands, a thou or two bigger bullet is fine. Important that every round is plunk tested in the chamber to ensure the loaded round chambers without bullet to rifling contact.
If the bullet is jammed into the rifling then excessive pressures will result.
I've loaded lots of .357 XTP bullets in a factory Glock .357 Sig barrel including 125, 140, 158, and 180gr. All work great!
Be aware though that there is variation barrel to barrel. I've found that carefully sized rounds that fit one barrel may not fit another. To remedy this I size all hot rod Sig loads to fit the shortest throated chamber of all my Sig Barrels.

 

I loaded some maximum (for my gun) blue dot loads and tested today.

As always please don't replicate without careful workups!

Gun: Ruger sr1911, 5" fusion 357sig barrel, 26lb recoil spring with flat bottom fps and 34lb hammer spring.

Speer 357sig brass, cci400s, blue dot powder in all loads.

65gr Lehigh extreme defense loaded to 1.225"
14g BD= 1966fps/557lbs, .4225 casehead

90gr xtp loaded to 1.190"
14g BD= 1946fps/756lbs, .4225 casehead

147gr xtp loaded to 1.270"
11g BD= 1568fps/802lbs, .424 casehead

158gr mbc coated swc loaded to 1.265"
11g BD= 1594fps/891lbs, .425 casehead

As you can see by the oal these loads are not possible in a 9mm/40 sized gun but loading to 10mm length makes the sig an even more impressive round, especially in a 5" barrel.

 

Ss30378,
Did that Ruger SR1911 start as a .45?

 

No 10mm, then added a 5" fusion w/n ramp bull barrel then throated it to run the heavy cast slugs.

 

Cool! Finally a good reason to buy a Ruger 10mm LOL
How do you like that SR1911?

Any extractor tuning? And what mags are you using?

 

I like it, its well built, has great sights and is accurate with either barrel. Ill also say the fusion barrel has been fantastic, fit, finish and function were awesome right out of the package. I took a .002 off the back of hood to smooth out lug engagement but everything else was spot on.

No extractor tunning was needed, the ejector was shortened and angled to get brass to fall where i wanted it. With the almost 900lb or energy 158gr load i just ran brass flew 4-5 feet. Same with my 10mm loads.

Factory 10mm ruger mags are what im using and they have fed fine.