Underwood 180gr FMJ plated Intercooler 12/2015

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood 180gr FMJ (plated)( supplied by Intercooler 12/2015)
Ballistics Information: 10mm Auto
Muzzle Velocity: 1350 fps
Muzzle Energy: 728 ft. lbs
Brass Make/Headstamp: Underwood - Brass
Bullet Make/Weight/Construction/Info; Length 0.6020"/Dia. 0.4000":  180gr. FMJ
Actual weigh 179.8 grains  Crimp Diameter 0.3970" 
Meplat 0.2500"  concaved base
C.O.A.L.: 1.2505"
Primer: Large PistolNickel color
Case: Diameter 0.4215" Crimp Diameter 0.4215" Length 0.9880"
Powder Description/Positive ID/Type/Charge Weight: Lovex D037.01 13.0 grains*
*(same load weights as AA#7)  same as Shooter's World - Major Pistol powder

[RDub01]

Hmm.. No 800-X this time..

[Intercooler]

So this is a newer one during the powder shortage.

[The_Shadow]

Underwood shows this for these 180gr bullets on their site;

Technical Information

Caliber: 10mm Auto
Bullet Weight: 180 Grains
Bullet Style: Speer Total Metal Jacket
Case Type: Brass
Ballistics Information:
Muzzle Velocity: 1350 fps
Muzzle Energy: 728 ft. lbs.

Glock 29 3.8" Barrel
Muzzle Velocity: 1249 fps

Glock 20 4.6" Barrel
Muzzle Velocity: 1300 fps

Colt Delta Elite 5" Bar-Sto Barrel
Muzzle Velocity: 1350 fps

Para Elite LS Hunter 6" Barrel
Muzzle Velocity: 1390 fps

[Pablo]

This is the one I was shooting and produced strange hard residue, and some rounds produced a lot more than others and seemed underpowered.

[The_Shadow]

It's hard to say what's going on with the ones you have, but this powder usually burns clean.  Was it a very cold day where you shoot?  Another thing that comes to mind is loose bullet fit may not have allowed a full power burn and pressure development.

The powder Underwood is using in these rounds is a LOVEX D037.01 or Major Pistol powder.  Shooters World seems to be the supplier under the name of  - Major Pistol powder.

I had samples of this powder and tested it to be sure of the yield.  This powder is said to use the same load data as AA#7.