Cartridge is from Ammo Manufacture: Underwood 180gr LFN-GC
Ballistics Information: 357 Magnum
Muzzle Velocity: 1400 fps
Muzzle Energy: 783 ft. lbs
Brass Make/Headstamp: Top Brass – Brass
Bullet Make/Weight/Construction/Info; Length 0.6700"/Dia. 0.3570": LFN-GC 180gr.
Meplat 0.2550"
Actual weight 180.0 grains  Cannelure groove 0.3465" / crimped heavy
C.O.A.L.: 1.5690"
Primer: Brass color
Case: Diameter 0.3760" Crimp Diameter 0.3650" Length 1.2820"
Powder Description/Positive ID/Type/Charge Weight: LilGun  16.8 grains

   Interesting. With Lil'Gun does it create some issues?

It's a little hotter than the book shows for a 180 Jacketed round, Hodgdon shows 15.0 grains
180 GR. NOS PART    Hodgdon    Lil'Gun    .357"    1.575"    13.0gr @ 1279 - 27,500 CUP  15.0gr @ 1422 - 34,500 CUP

There is another powder called 300MP from Alliant, but I haven't seen it in a good picture of it yet.

 I found this information but don't know what the issue is:

Because of the known issues with Lil' Gun and revolvers, I don't use it in mine anymore


Any idea on that statement?

Erosion of the forcing cones was mentioned, however they may be using massive charges of it, yield heat and gas to work on the area.

  When you look at the sheet Kevin's 180's have .2gr's more of the same powder as Buffalo Bore. The Chronograph results 1387 versus 1400. Interesting!

Cartridge is from Ammo Manufacture: Double Tap 200gr hard cast WFN-GC
Ballistics Information: 357 Magnum
Muzzle Velocity: 1310 fps
Muzzle Energy: 761 ft. lbs
Brass Make/Headstamp: DT Double Tap – Nickel 
Bullet Make/Weight/Construction/Info; Length 0.8430"/Dia. 0.3570": WFN-GC 200gr.
Meplat 0.2600"
Actual weight 204.0 grains  Cannelure groove 0.3485" / crimped heavy in the upper groove
C.O.A.L.: 1.5855"
Primer: Nickel color
Case: Diameter 0.3745" Crimp Diameter 0.3695" Length 1.2825"
Powder Description/Positive ID/Type/Charge Weight: H-110 / W296  14.4 grains
Intercooler Tested
DoubleTap 200gr Hardcast (GP100 6") 1316, 1344, 1324, 1299, 1318, 1331, 1299. Average = 1318.71 FPS/ 772 LBS.

Interesting. The 180 will probably be the same but a little more powder.

Cartridge is from Ammo Manufacture: Double Tap 180gr hard cast WFN-GC
Ballistics Information: 357 Magnum
Muzzle Velocity: 1360 fps
Muzzle Energy: 739 ft. lbs
Brass Make/Headstamp: DT Double Tap – Nickel 
Bullet Make/Weight/Construction/Info; Length 0.7230"/Dia. 0.3570": WFN-GC 180gr.
Meplat 0.2670"
Actual weight 179.0 grains  Cannelure groove 0.3485" / crimped heavy
C.O.A.L.: 1.5855"
Primer: Nickel color
Case: Diameter 0.3745" Crimp Diameter 0.3695" Length 1.2740"
Powder Description/Positive ID/Type/Charge Weight: H-110 / W296  16.0 grains
Intercooler tested.
DoubleTap 180gr Hardcast (GP100 6") 1349, 1370, 1332, 1383. Average = 1358.5 FPS/ 738 LBS.

Cartridge is from Ammo Manufacture: GECO 158gr JHP
Ballistics Information: 357 Magnum
Muzzle Velocity: 1400 fps
Muzzle Energy: 687 ft. lbs
Brass Make/Headstamp: GECO – Brass
Bullet Make/Weight/Construction/Info; Length 0.6675"/Dia. 0.3565": 158gr. JHP
HP depth 0.1600" / HP dia. 0.0775" / HP mouth 0.2200"
Actual weight 157.4 grains  crimped 0.3560" medium
C.O.A.L.: 1.5800"
Primer: Brass color
Case: Diameter 0.3760" Crimp Diameter 0.3745" Length 1.2780"
Powder Description/Positive ID/Type/Charge Weight: ? proprietary ? 9.4 grains*
*RamShot True Blue (158 HDY XTP 8.6gr @ 1,132 fps and 9.5gr @ 1,258 fps - 34,700 psi 1.590")
LOVEX is a posibility D037.01 with 10.8gr @ 1,312 fps

Yup. Looks good!

The GECO being a foreign product and said to produce their own components and possibly powders as well.  The powder looks similar to the stuff in their 9mm product.  Based on the lighter charge weight and velocity obtained it's a fast burning, small flattened ball powder, looking at it you could confuse it for H-110/296, but it doesn't fit that profile.

Cartridge is from Ammo Manufacture: Hornady 125gr FTX (Flex Tip Hollow Point)
Ballistics Information: 357 Magnum
Muzzle Velocity: 1500 fps
Muzzle Energy: 624 ft. lbs
Brass Make/Headstamp: Hornady - Nickel
Bullet Make/Weight/Construction/Info; Length 0.6340"/Dia. 0.3565": Hornady FTX  125gr.
Actual weight 124.8 grains  cannelure 0.3525"
C.O.A.L.: 1.5470"
Primer: Brass color
Case: Diameter 0.3750" Crimp Diameter 0.3730" Length 1.2830"
Powder Description/Positive ID/Type/Charge Weight: Power Pistol  10.0 grains

Cartridge is from Ammo Manufacture: Hunting Shack Inc. HSM Bear Load 180gr RNFN-GC
Ballistics Information: 357 Magnum
Muzzle Velocity: 1200 fps
Muzzle Energy: 576 ft. lbs
Brass Make/Headstamp: Star Line – Brass
Bullet Make/Weight/Construction/Info; Length 0.7720"/Dia. 0.3575": LFN-GC 180gr.
Meplat 0.2585"
Actual weight 186.2 grains  Cannelure groove 0.3250" / crimped heavy
C.O.A.L.: 1.5520"
Primer: Brass color
Case: Diameter 0.3755" Crimp Diameter 0.3630" (Roll Crimp) Length 1.2825"
Powder Description/Positive ID/Type/Charge Weight: LilGun  14.4 grains

That explains why the HSM performed well. I hope the .44's do the same!