Buffalo Bore 125gr JHC & 180gr LFN-GC 357 Magnum Pull-Down

[The_Shadow]

Cartridge is from Ammo Manufacture: Buffalo Bore 125gr JHC
Ballistics Information: 357 Magnum
Muzzle Velocity: 1700 fps from 6" BBL
Muzzle Energy: 802 ft. lbs
Brass Make/Headstamp: Top Brass – Brass
Bullet Make/Weight/Construction/Info; Length 0.5465"/Dia. 0.3570": 125gr JHC
Actual weight 125.0 grains  crimped hard
HP depth  HP 0.0840" / HP dia. (tapered) / mouth 0.1500" / Nose cuts-6  0.1180"
C.O.A.L.: 1.5790" & 15790"
Primer: Nickel color
Case: Diameter 0.3755" Crimp Diameter 0.3635" Length 1.2860"
Powder Description/Positive ID/Type/Charge Weight: H-110 / 296 21.8 grains

[The_Shadow]

Cartridge is from Ammo Manufacture: Buffalo Bore 180gr LFN-GC
Ballistics Information: 357 Magnum
Muzzle Velocity: 1400 fps
Muzzle Energy: 783 ft. lbs
Brass Make/Headstamp: A USA – Brass
Bullet Make/Weight/Construction/Info; Length 0.7700"/Dia. 0.3575": 180gr LFN-GC
Actual weight 180.8 grains  crimped hard / Case Dia below Crimp 0.3780"
MEPLAT 0.2590"
C.O.A.L.: 1.5545" & 1.5545"
Primer: Nickel color
Case: Diameter 0.3765" Crimp Diameter 0.3625" Length 1.2865"
Powder Description/Positive ID/Type/Charge Weight:  LilGun ? 16.6 grains

[wadcutter]

I don't know what kind of powder BB uses for the 180 grain load but it's definately not pp300mp or Lilgun.   As for their 125 grain load the powder does look a lot like H110 but 21.8 grains is below the max load in my Lyman reloading manual and would only achieve about 1500fps in a 4" revolver. I've read that BB uses powders that are not available to the public and  I have no reason to doubt it considering the velocity they're able to obtain while staying under 35k psi.

[The_Shadow]

I really thing that the powder for the 180 gr LFN-GC is LilGun.  Hodgdon shows a loading with a Nosler Partition Jacketed 180gr.  using LilGun with 15.0 grains @ 1422 fps and 34,500 CUP, so there is room for a little more powder, especially using a cast bullet that is probably shorter in total length. 

If I had some LilGun powder I'd work up some test to verify it.

The 125 grain is definetly H-110 or 296 as they are the most widely used in 357 and 44 for many loadings to get velocity with lower pressures for the most part.