357 Magnum Factory/Commercial Ammo pulldown

[The_Shadow]

Cartridge is from Ammo Manufacture: Atomic Ammo 158gr Hex Plated JHP
Ballistics Information: 357 Magnum
Muzzle Velocity: 1550 fps
Muzzle Energy: 842 ft. lbs
Pictures: Before/After disassembly:
Brass Make/Headstamp: StarLine - Nickel
Bullet Make/Weight/Construction/Info; Length 0.6660"/Dia. 0.3565": Hex Plated 158gr. JHP Actual weight 157.8 grains  crimped hard
C.O.A.L.: 1.5800"
Primer: Brass color
Case: Diameter 0.3760" Crimp Diameter 0.3635" Length 1.2835"
Powder Description/Positive ID/Type/Charge Weight: ? Lil'Gun 18.0 grains
Tested in the S&W model 19 6" 1265 fps / 1275 fps June 8, 2013
Cases expanded to 0.3835" / 0.3840", primers slightly flattened, cases look good.

[Intercooler]

Chopinbloc got a couple of these for gel. I should have told him do this right after the DoubleTap .357's.

[The_Shadow]

Keep in mind that I haven't worked with Lil'Gun powder...it is my speculation that this load is Lil'Gun powder, based on the profile of the amount of powder, data with it and velocity claims.  However, I have never worked with this powder and only have two pictures to compare it with.
I hope someone who has some Lil'Gun powder, could post a picture of this powder or e-mail the picture as a file to me.
_Shadow_(at)Bellsouth.net  place the @ sign where it belongs for those who wish to contribute to the madness!

Update:  I did get Hodgdon Lil Gun powder and have confirmed my speculations as to that being it!  Worked with this powder in 458 SOCOM as well...

[Intercooler]

Added to the sheet. As info they are rated 1350 FPS but gave 1374/664 for me.


Could we move all the other .357's under one post here?

[The_Shadow]

Cartridge is from Ammo Manufacture: LAPUA 158gr JSP
Ballistics Information: 357 Magnum
Muzzle Velocity: 1230 fps
Muzzle Energy: 530 ft. lbs
Pictures: Before/After disassembly:
Brass Make/Headstamp: LAPUA - Brass
Bullet Make/Weight/Construction/Info; Length 0.6735"/Dia. 0.3570": 158gr. JSP
Actual weight 157.8 grains  crimped hard
C.O.A.L.: 1.5840" & 15770"
Primer: Nickel color
Case: Diameter 0.3755" Crimp Diameter 0.3675" Length 1.2830"
Powder Description/Positive ID/Type/Charge Weight: ? Vihtavuori N105  10.0 grains
Tested in the S&W model 19 6" 1239 fps /1266 fps June 8, 2013
Cases expanded to 0.3830" / 0.3825", primers slightly flattened, cases look good.

[Intercooler]

Interesting and different one. I bought those when SG had a deal going for a try. They are right there with powder charges of greater amounts.

[The_Shadow]

Cartridge is from Ammo Manufacture: Precision 1 Speer 125gr JHP
Ballistics Information: 357 Magnum
Muzzle Velocity: 1400 fps
Muzzle Energy: 543 ft. lbs
Pictures: Before/After disassembly:
Brass Make/Headstamp: FIOCCHI USA - Nickel
Bullet Make/Weight/Construction/Info; Length 0.5365"/Dia. 0.3570": Speer 125gr. JHP
Actual weight 125.0 grains  crimped hard
C.O.A.L.: 1.5775" & 1.5825"
Primer: Nickel color
Case: Diameter 0.3755" Crimp Diameter 0.3735" Length 1.2810"
Powder Description/Positive ID/Type/Charge Weight: Unique 8.6 grains **One cartridge had ONLY 0.6 grains
Tested in the S&W model 19 6" 1270 fps /1110 fps June 8, 2013
Cases expanded to 0.3825" / 0.3825", primers slightly flattened, cases look good.



**One cartridge had ONLY 0.6 grains of powder  (Not Good - would have been a possible squib round)

[Intercooler]

Wow


So that could have been a squib? That's horrible! Unfortunately I have a good bit of Precision One left. It's not really any cheaper than other stuff and quality control looks a little lacking. I also remember they had real issues with their site and none of it was real strong.

So far we have had one low powder charge, one 180 that was actually 200's... and we have only pulled 1-2 from each MFG 

[Intercooler]

And it still is months later. I'm wondering if they actually closed up shop?

http://www.precisiononeammunition.com/index.php?main_page=down_for_maintenance

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood 158gr Hex Plated JHP
Ballistics Information: 357 Magnum
Muzzle Velocity: 1400 fps ? the Speer Bonded is shown as 1475 fps
Muzzle Energy: 687 ft. lbs ? the Speer Bonded is shown as 763 ft lbs
Pictures: Before/After disassembly:
Brass Make/Headstamp: StarLine - Brass
Bullet Make/Weight/Construction/Info; Length 0.6585"/Dia. 0.3565": Hex Plated 158gr. JHP
Actual weight 158.4 grains  crimped hard
C.O.A.L.: 1.5705" & 1,5625"
Primer: Nickel color
Case: Diameter 0.3760" Crimp Diameter 0.3710" Length 1.2800"
Powder Description/Positive ID/Type/Charge Weight: H-110 or 296 14.6 grains
Tested in the S&W model 19 6" 925 ? fps /1183 fps June 8, 2013
Cases expanded to 0.3825" / 0.3830", primers slightly flattened, cases look good.

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood 125gr Montana Gold JHP
Ballistics Information: 357 Magnum
Muzzle Velocity: 1600 fps
Muzzle Energy: 711 ft. lbs
Pictures: Before/After disassembly:
Brass Make/Headstamp: RP & RWS - Brass
Bullet Make/Weight/Construction/Info; Length 0.5630"/Dia. 0.3570": Montana Gold  125gr. JHP
Actual weight 125.6 grains  crimped hard
C.O.A.L.: 1.5890" & 1.5800"
Primer: Brass color
Case: Diameter 0.3770" Crimp Diameter 0.3725" Length 1.2830"
Powder Description/Positive ID/Type/Charge Weight: H-110 or 296  21.0 grains
Tested in the S&W model 19 6" 1575 fps /1518 fps June 8, 2013
Cases expanded to 0.3835" / 0.3830", primers slightly flattened, cases look good.

[Intercooler]

Precision One 125 was rated 1400 FPS and gave 1398 FPS out of my GP100.

[The_Shadow]

Thanks for that update on the Precision 1, I added that to the data sheet.

[RDub01]

Heya Shadow..
I pulled down some Speer 125gr a while back and found 20.8grs of a ball powder.  Interesting..

http://smith-wessonforum.com/reloading/189366-357-mag-125gr-factory-duplication.html

[The_Shadow]

RDub01, that's good info, I wish you could post some closeup powder pictures to help ID them. I have lost my Hard Drive which had my powder picture files, I still have the pictures of powder I took, But I had a great data file of powder pictures.  It will be a while before I can rebuild those files.  New Hard drive on order!

Heavy crimps will help with the best ignition with these heavy charges for the 357 mag or 44 mag, as any other straight wall cartridge that is roll crimp-able.  Mag Primers can also help but some charges may need to be adjusted.