Underwood 200gr Hard Cast provided by Intercooler Nov 2017

[The_Shadow]

Cartridge is from Ammo Manufacture: Underwood 200gr Hard Cast provided by Intercooler Nov 2017
Ballistics Information: 10mm Auto
Muzzle Velocity: 1250 fps
Muzzle Energy: 694 ft. lbs
Brass Make/Headstamp: Underwood - Nickel
Bullet Make/Weight/Construction/Info; Length 0.6760"/Dia. 0.4015"/ Hard Cast 200gr. HC Actual weight 198.8 / 199.4 grains 
Meplat 0.2800": top band 0.1640"/bottom band 0.1600"/lube groove 0.1200"/nose 0.2400"
C.O.A.L.: 1.2480" / 1.2475"
Primer: Large Pistol primer Nickel color
Case: Diameter 0.4215" Crimp Diameter 0.4225" / 0.4230" Length 0.9850"
Powder Description/Positive ID/Type/Charge Weight: Power Pistol 8.4/ 8.4 grains

[Intercooler]

Is this the first 200 dissections? Any idea on the bullet?

[The_Shadow]

Made a change to the energy figure. 
Looks like the old Lyman TC, but So many molds are out there...They list it as Bullet Style: Hardcast Flat Nose 21 BHN

[Intercooler]

In the past he used Rim Rock. I wonder if this is from them?

[The_Shadow]

The Underwood bullet has a flat base and Rimrock .40/10MM 200 GR. TC " THE OUTDOORSMAN" shows a tapered base.

[Commo]

I'm interested in using this round -- and reloads that replicate it -- in my new Glock 20.

Underwood now shows it as a Hi-Tek coated bullet so I'm wondering if other changes have been made.

Anyone know who makes this 200-grain Hi-Tek coated 21BHN bullet? And would Power Pistol still seem to be the likely powder they use? I have been loading with BE-86 and would like to see how it works with a 200-grain hard cast..

If any of our pulldown experts would like I'd be happy to provide the needed rounds for testing. Additionally, I have a LabRadar and will be testing this ammo in the next week or two and will post the results.

Thanks,

Commo
(SE Michigan)

[Grenadier]

I bought some and they are a different bullet. The box says, "200gr Hi-Tek Coated Hard Cast FN, 1250 fps". The bullets have a maroon color coating. I chronographed them at 1235 fps from my 6" Kimber. They were the best grouping rounds I've fired so far! Personally, I'm glad they're coated.

I shot all of mine up but I'm about to order some more.

[sqlbullet]

It does appear that Underwood has switched from traditionally lubed cast bullets to the powder coated version in 200 grain.

[Kenk]

Just wanted to say, you guys do an awesome job on these!

[Commo]

Just wanted to say, you guys do an awesome job on these!

Agreed!

How do you pop apart these pistol rounds, I'm assuming a hammer-type puller? I have pulled rifle rounds with a Hornady Cam-lock puller and it seems like I wouldn't be able to get a grip on pistol rounds.

I'm ordering a couple boxes (I wish they sold them in 50-round boxes) so the offer stands if someone would like to conduct an official pull down analysis..

Commo

[sqlbullet]

Kinetic bullet puller.

[Kenk]

On a 4x4 block of wood, or so I have been told, regardless; it works for my needs

[The_Shadow]

Yes I use a Kinetic bullet puller from RCBS  Older from the late 70's, I strike it on the end grain of 4" x 4"  block about 2 foot long standing on the carpeted floor.  I also strike it so it doesn't bounce when it contacts the block, watch for when the bullet is about to pull free as to get it to just drop out softly.  This so I collect all of the powder and not have any bounce out of the puller.

Then working over a clean sheet of typing paper, I pour the powder out into the scale pan while catching the bullet.  I use a small paint brush to sweep any powder off of the bullet into the pan and off my fingers if there is any.  Depends on the type of powder.  I also use a "D Cell Battery" to tap the puller to dislodge any powder that might stick inside the tube.  However when it is clean and free of bullet lube or other stuff powder usually doesn't stay inside.

If any specks or kernels of powder miss the scale pan, they will be on the clean paper and can be picked up and put in the pan.  I am very meticulous when working with the pull downs.  Accuracy is the key to the documentations...

I have pulled so many cartridges down with this puller, I wore out the original three jaw set.  RCBS actually set me a new set free of charge.

[sqlbullet]

On a 4x4 block of wood, or so I have been told, regardless; it works for my needs

I find concrete, or an anvil to work better.  Wood "gives" some and that is energy that doesn't go into pulling the bullet.

[The_Shadow]

On a 4x4 block of wood, or so I have been told, regardless; it works for my needs

I find concrete, or an anvil to work better.  Wood "gives" some and that is energy that doesn't go into pulling the bullet.

Yea, but the puller will love the wood, as the concrete or anvil may impart that energy right back in the form of a crack or failure to the Kinetic bullet puller.  Just about everyone of the failed pullers were hit on concrete or steel.  These newer pullers with plastic handles seem to fail often.