Underwood 140gr Xtreme (Lehigh) Penetrator and 140gr Controlled Fracturing HP

[halfglocked]

Yehaw, I really wanted to see how these Lehigh loads work and how the "lite" 140.extreme penatrator works , hopefully better than the defunct extreme ammo fang face, and freedom rounds.

[mag360]

140gr moving nearly over 1500fps has got to be a good deer load as well! Talk about flat shooter with its ballistic coefficient.

[wadcutter]

How good could the BC of 140 grain 40 cal bullet possibly be?

[Centimeter]

Probably closer to .100 than to .200, but certainly less than .200 

[Raggedyman]

I hope to test the fragmenting one next time I go out. Been meaning to since Intercooler sent it but other stuff keeps getting in the way.

As for the penetrator, we're gonna need a bigger block, to paraphrase Jaws.

[mag360]

Its long copper bullet

[G20Lou]

I like this round and the XP concept all around. I recently wrote Lehigh Defense suggesting this style of projectile but in the form of a 12 GA slug... but I digress.

I am a firm believer that the application determines the tool to be used. I have several options for ccw but one of them is the G20 with these XPs.

When I am out riding the Harley in the middle of nowhere, it feels good to have the 10mmXPs by your side. You never know what you will come up on out there, human, animal or mechanical (I've had A-holes try to run me off the road.) and there is no civilization near you.  The versatility of this round to penetrate far and do some degree damage along the way makes this an appealing ride companion for exploring the long, high roads of the Colorado Rockies.

[kilibreaux]

Underwood 140 grain xtreme penetrator - 10mm 140 grain, fired from a G20SF with OEM 4.6" barrel, 22# spring over SS guide rod, 10' from Shooting Chrony recorded an average velocity of 1,447 fps, for 651 lb-ft of kinetic energy.

This isn't terrible for a 10mm load, but it's not anywhere close to other Underwood loads I've tested.  I have noticed all the "xtreme penetrator" rounds seem to be loaded down from other bullets in similar weights.

By comparison, Underwood 10mm 155 grain JHP blasted from the OEM barrel G20SF at 1,524 fps average for 800 lb-ft of kinetic energy. and from the G29SF 3.6" barrel at 1,434 fps average for 708 lb-ft of kinetic energy.

Considering what Liberty is doing with ultralight 10mm loads, one would think Underwood would push the 140 grain slug as fast as possible....and clearly 1,447 average from a G20 isn't that.

[Pinsnscrews]

Underwood 140gr Xtreme P
EAA Elite Limited 4.75" 1586, 1591, 1575. Average = 1584 FPS/ 780 LBS

Underwood 140 grain xtreme penetrator - 10mm 140 grain, fired from a G20SF with OEM 4.6" barrel, 22# spring over SS guide rod, 10' from Shooting Chrony recorded an average velocity of 1,447 fps, for 651 lb-ft of kinetic energy.

That is a very big difference in velocity...

[Intercooler]

 When we are talking about the 140's are you factoring in the longer bullet? I think being all copper it's longer, giving less space for powder.

[Gen4G20]

What would the wound channel width be with these in the 10mm? I would like to use these for deer but I don't know if it would be a good round. I know the penetration is there but is that all?

[sqlbullet]

What would the wound channel width be with these in the 10mm? I would like to use these for deer but I don't know if it would be a good round. I know the penetration is there but is that all?

About the same as a full metal jacket.  Maybe a bit more.

This design originated I believe with Polycase.  Their bullets are made from copper powder and epoxy resin, and therefore won't expand.  This was an attempt to get some additional damage from a non-expanding bullet.  And it gives just a little bit more over FMJ.

But the little bit more on average had them overlapping with FMJ.  In other words, the 4 biggest wound cavities with FMJ out of twenty shots will be bigger than the 4 smallest out of twenty with this round.  (numbers made up to illustrate the point).

If you want a good hunting bullet, look to a good HP design.  If you hunt in a lead free area, then the Barnes 155 grain is a better choice.

[joshuamalezi]

Here's a cool video of the 140 Ext Pen going through bullet proof glass.

[Captain_Witness]

Latest is their 115 grain Penetrator @ 1700 FPS. Every third round in my carry mags is one of these.. it has been suggested that they can easily penetrate 3A Kevlar, which is why I carry them. Where I live a shoot is either righteous or not and this ammo is perfectly legal. It's also very likely the best thing going for the poor bastages in NJ, who cannot use hollowpoints

[DizzyDean]

Underwood 140 grain xtreme penetrator - 10mm 140 grain, fired from a G20SF with OEM 4.6" barrel, 22# spring over SS guide rod, 10' from Shooting Chrony recorded an average velocity of 1,447 fps, for 651 lb-ft of kinetic energy.

This isn't terrible for a 10mm load, but it's not anywhere close to other Underwood loads I've tested.  I have noticed all the "xtreme penetrator" rounds seem to be loaded down from other bullets in similar weights.

By comparison, Underwood 10mm 155 grain JHP blasted from the OEM barrel G20SF at 1,524 fps average for 800 lb-ft of kinetic energy. and from the G29SF 3.6" barrel at 1,434 fps average for 708 lb-ft of kinetic energy.

Considering what Liberty is doing with ultralight 10mm loads, one would think Underwood would push the 140 grain slug as fast as possible....and clearly 1,447 average from a G20 isn't that.

Xtreme penetrators are solid copper and are much lighter then bullets using lead. To get the same grain weight, the bullets need to be bigger and as such, they use up more of the case capacity for powder, consequently they are slower then standard Underwood offerings. They still have some unique qualities and seem to be superior compared to standard loads for certain jobs, particularly against barriers, soft armor and bullet proof glass.