[ss30378]

SD as usual very impressive numbers you've reached. Your 800x loads give me a great idea where to start on my long oal loads. Thanks for posting!

 

[ss30378]

Blue Dot Data:

Glock 21sf, lone wolf solid top longslide, 6" g20 357sig barrel throated for long bullets

125gr Zero JHP .358 dia, 12.0gr @ 1.240" = 1602fps
158gr Berrys PHP .358 dia, 9.0gr @ 1.250" = 1314fps
180gr MBC Cast RNFP .358 dia, 9.0gr @ 1.250" = 1289fps

 

[ss30378]

Another addition:
158gr Berry's PHP .358 dia, 9.5gr Blue Dot @1.250" = 1371fps

180gr MBC Coated Pugnose, .359 dia, 9.0gr Blue Dot @ 1.250" = 1278 fps

 

[ss30378]

Warning!!! Well beyond any book maximum! This was worked up in a gun modified to use 357sig ammo loaded to 10mm length. Trying to duplicate at a shorter OAL may result in serious damage to the gun and or shooter! Use for informational purposes only!!! Be safe!

125gr extreme tcfp .358 dia, 11.0gr Longshot @1.260" = 1736fps avg in 6" barrel

836lbs of energy!!!

 

[ss30378]

I will say that 11.0 grains of LongShot is a lot and getting in the area of too much pressure! Your barrel probably has a good chamber support...BUT!~ Your 6" barrel length is yielding the higher velocity gains with the extreme loading you are using.

This was the data derived from ammo pull-down that actually caused a casing blowout, Underwood is known for pushing the envelope...
Cartridge is from Ammo Manufacture: Underwood 125gr Bonded FMJ
Ballistics Information: 357 SIG
Muzzle Velocity: 1475 fps
Muzzle Energy: 603 ft. lbs
Brass Make/Headstamp: Star Line – Brass
Bullet Make/Weight/Construction/Info; Length 0.5400”/Dia. 0.3555”:
125gr. JHP Actual weight 125.6 grains / 124.2 grains / 124.6 grains
C.O.A.L.: 1.1240” / 1.1235” / 1.1330”
Primer: Brass color
Case: Diameter 0.4220” all
Crimp Diameter 0.3785” / 0.3790” / 0.3790” crimp medium
Length 0.8600” / 0.8610” /
Powder Description/Positive ID/Type/ LongShot
Charge Weight: 9.8 grains
10.0 grains
10.0 grains

I also load mine to full 10mm length, the 11.0g load isn't even compressed at 1.260

 

[ss30378]

Shadow,

Yes my barrel has been throated to chamber the 180s (far right) seated to max length allowable in the g20 mag. Compared to the standard length sig on the left, seating them long does indeed free up some case capacity.

You are correct that trying to duplicate this load in a gun not set up for this may lead to trouble so as always those should start low (in this case much lower) and work up.

The 125 grain load in question has the bullet seated to the base of the neck giving about as much capacity as the sig will allow. Primers we're starting to flatten but not terrible. Case head measured .426

 

[ss30378]

I do not but it is on my Christmas wishlist! I've seen all the testing and data over at 10mm-firearms and it looks very impressive. Breaking 2000fps sounds like fun and would make for some great coyote medicine.

 

[ss30378]

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!!!

 

[ss30378]

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)

 

[ss30378]

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!!!

 

[ss30378]

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!

 

[ss30378]

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

 

[ss30378]

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

 

[ss30378]

Addition to the data above:

13.0g = 2051fps/840lbs .4265 casehead

 

[ss30378]

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!

 

[ss30378]

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!)

 

[ss30378]

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.

 

[ss30378]

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.

 

[ss30378]

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]

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.