Underwood 180gr Speer TMJ Pull-Down

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood 180gr  Speer TMJ
Ballistics Information: 10mm Auto
Muzzle Velocity: 1300 fps
Muzzle Energy: 675 ft. lbs
Brass Make/Headstamp: Star-Line - Brass
Bullet Make/Weight/Construction/Info; Length 0.6015"/Dia. 0.4000":  180gr. Speer TMJ
Actual weigh 179.2 grains  Crimp Diameter 0.3985"  meplat 0.2475"
C.O.A.L.: 1.2445"
Primer: Nickel color
Case: Diameter 0.4220" Crimp Diameter 0.4215" Length 0.9880"
Powder Description/Positive ID/Type/Charge Weight: Power Pistol 9.8 grains
Tested in 10mm S&W1006 5" 1312 fps (failed to extract) / 1025 fps ? June 8, 2013
Cases expanded to 0.4275" / 0.4280", primers moderately flattened, small bit of leakage, cases show some stress but no smiles.

[RMM]

Interesting.  I wonder what these will chrono?  Do you think he ran out of 800x or is switching powders due to the difficulty in consistently metering 800x?

[Intercooler]

These were roughly a tad under 1300 FPS and why I labeled them like that  So the powder has changed too and slightly under the Buffalo Bore charge which gave more on the Chronograph at 10.0gr's Power Pistol. 

[Intercooler]

I changed the sheet to reflect what you got in the pull-down. Who knows if Kevin will go back to 800-X but I kind of doubt it.

[The_Shadow]

Did you list these as a different listing for previous data?  Yes they should be close to 1300 fps.

Buffalo Bore's 10.0 grains Power Pistol was listed at 1350 fps.

[Intercooler]

No, just updated the Underwood TMJ. I figure Kevin will never go back at this point now.

[REDLINE]

Did you list these as a different listing for previous data?  Yes they should be close to 1300 fps.

Buffalo Bore's 10.0 grains Power Pistol was listed at 1350 fps.

The BB load does right around 1325 FPS from the G20 4.6".

[REDLINE]

It's still settling in with me that Kevin seems to be done with IMR 800-X.

I'm so glad we did all the pull downs of his original work.

I'll be curious to see how these actually chrono.

[doverpack12]

The BB load with what I believe is a winchester bullet chronos about 1295 out of my G20 with stock bbl and 22# spring.

[Intercooler]

These have been done several times an added in the sheet. They are a pinch under 1300 FPS now.

[DAVIDF]

For those of you that reload, how do you like Power Pistol? Does it meter well? Finicky with temperatures?

The_Shadow, thanks for this. Great info. Did you pull down more than 1 round & if so was the powder charge very consistent?

[RMM]

It meters very consistently through my pro auto disk.  I'm not too sure about the temperature sensitivity.  It is one of "the" powders for high performance 9mm but it hasn't been on my radar for high performance 10mm until now...

[Patriot]

Is Underwood done with 800x or is he having a hard time getting mass quantities of it so he switched to what he could get for now?

[DAVIDF]

RMM, thank you. Sounds perfect for me as once components become more available, I want to start reloading 9 & 10mm. I've been doing it for 44mag but using Unique & H110.

[RMM]

Is Underwood done with 800x or is he having a hard time getting mass quantities of it so he switched to what he could get for now?

It seems like 800x has become available faster than a lot of the other popular powders but of course I don't know anything about mass quantities. 

This is just my speculation, but I'll bet that he is switching for good.  If I were a mass producer of ammo I wouldn't want the headache involved with 800x (extremely hard metering).  Somehow he has 800x metering fairly well from an automated measure, but as we've all seen there have been a few rounds (more than is acceptable) that have been outside of the safe zone (which is very small when running at this level). 

By switching to a powder that meters more consistently but still provides similar performance Kevin will be able to produce more ammo with less potential liability.