44 Magnum Underwood Ammo 180gr XTP & 300 XTP Pull-Downs

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood Ammo  180gr XTP
Ballistics Information: 44 Magnum
Muzzle Velocity: 1600 fps
Muzzle Energy: 1023 ft. lbs
Brass Make/Headstamp: StarLine - Brass
Bullet Make/Weight/Construction/Info; Length 0.5550"/Dia. 0.4300":  180gr. XTP
Actual weigh 180.0 grains  Cannelure Diameter 0.4175" 
HP Inside Dia 0.1430"   HP Depth 0.1135" Mouth 0.2050"
C.O.A.L.: 1.5975"
Primer: Brass color
Case: Diameter 0.4535" Crimp Diameter 0.4525" Length 1.2730"
Powder Description/Positive ID/Type/Charge Weight: H-110/W 296  28.4 grains
Tested from S&W Model 29 8 3/8" 1598 fps June 8th 2013
Case expanded to 0.4590", primer rounded, case look good.

[Intercooler]

It's odd this one is slower with more of the same powder as the ones above it 

[The_Shadow]

Hodgdon shows the 180gr XTP H-110/296 29.0gr. @ 1714 fps 21,800 C.U.P., so this is below there lower end load...

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood Ammo  300gr XTP
Ballistics Information: 44 Magnum
Muzzle Velocity: 1200 fps
Muzzle Energy: 959 ft. lbs
Pictures: Before/After disassembly:
Brass Make/Headstamp: StarLine - Brass
Bullet Make/Weight/Construction/Info; Length 0.8585"/Dia. 0.4300":  300gr. XTP
Actual weigh 300.0 grains  Cannelure Diameter 0.4155" 
HP Inside Dia 0.0790"   HP Depth 0.0770" Mouth 0.2235"
C.O.A.L.: 1.5930"
Primer: Brass color
Case: Diameter 0.4535" Crimp Diameter 0.4500" (heavy crimp) Length 1.2755"
Powder Description/Positive ID/Type/Charge Weight: H-110/W 296  18.6 grains
Tested from S&W Model 29 8 3/8" 1094 fps / 1121 fps June 8th 2013
Case expanded to 0.4605", primer slightly flattened, case look good.

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood Ammo  180gr XTP
Ballistics Information: 44 Magnum
Muzzle Velocity: 1700 fps
Muzzle Energy: 1154 ft. lbs
Brass Make/Headstamp: StarLine - Brass
Bullet Make/Weight/Construction/Info; Length 0.5570"/Dia. 0.4300":  180gr. XTP
Actual weigh 180.2 grains  Cannelure Diameter 0.4175" 
HP Depth 0.1320" HP Inside Dia 0.1430"   Mouth 0.2385"
C.O.A.L.: 1.5920"
Primer: Brass color
Case: Diameter 0.4535" Crimp Diameter 0.4490" Length 1.2730"
Powder Description/Positive ID/Type/Charge Weight: ? powder looks like H-110/W 296) ?  23.4 grains
(This is less powder than previously pulled 180gr @ 1600 fps with 28.4gr)(I'll test it at this loading but expect it will not make the 1600 fps as seen in the first test)(Reviewing more info looking for powder/performance in question)

[Intercooler]

The powder is different than the 1600 FPS version. Every shot was over over 1700 FPS out of my Redhawk. Could it be Lil'Gun?

[The_Shadow]

In this cartridge the powder is H-110/296, but it is probably a short load...   When I get to shoot it we will see more.

Hodgdon shows the following data for the 44Mag Hornady 180XTP from 8.275" barrel
H-110/296 29.0 grains @ 1714 fps 21,800 CUP
H-110/296 31.5 grains @ 1896 fps 29,900 CUP

[Intercooler]

So do you think the first one rated 1600 FPS was something not H-110/296?

[The_Shadow]

I was thinking he was going to load to 30.0 grains possibly...
One powder I have no picture or have seen is Accurate 4100, I think it is newer.  Question is does it look like 296/H-110
The newest Western Powders book shows a 24.3 grain load value @ 1683 fps...  I need to find this powder and further investigate...