I don't have it yet, but found someone with a Witness barrel and some 9x25 ammo. It was something I always wanted to try and 6" is perfect. Hopefully it pans out okay and the barrel has plenty of support.

These will be the first tests ASAP and I hope to find some more for testing.

Very cool. Been shooting all the available ammo in my Glock 20L - love to see the numbers!

Anyone know what barrel length Underwood rates the 9x25 on?

IC, the testing data is likely 6" tube... here is some data tested via three different barrel lengths...

Underwood vs. Double Tap Gold Dot 125 JHP

Barrel 6" LWD   Velocity   Energy Ft/Lb
Underwood      1699      801
Double Tap      1587      699

Barrel 4.6" LWD   Velocity   Energy Ft/Lb
Underwood      1588      700
Double Tap      1498      623

Barrel 3.8" LWD   Velocity   Energy Ft/Lb
Underwood      1522      643
Double Tap      1430      568


Box listed Velocity was for 6" barrel
Underwood   1700 fps
Double Tap   1695 fps

Why was the DT so low? 

DT has less Longshot powder in theirs...
It will be interesting to see what UW is stuffing their with in your sample...
We have seen Longshot in some and IMR800X in the past.  Will these have some other powders?

I posted another thread showing the barrel versus a 10mm. Does anyone have any pre/post brass measurements I can compare what he sent me with the barrel?

The Xtreme Defender will be very interesting to look inside...the others too to see if they changed from previous powder and charge weights.

I have the barrel in and ready to go! The only problem is rain, rain, rain and more rain! Next week is looking good from Tuesday on 

The only thing I saw in messing with it was a missing guide rod dimple on the end of the peanut. This is mainly to anchor that end and if it should create some issue the first session I will Dremel one there.

   It looks like all of these Underwood rounds made the numbers if they're based on a 6" barrel. The 9x25 seemed to be softer shooting and this barrel setup ran good!

EAA Super Match 6"
Underwood Ammo 90gr Xtreme Defender 1987, 1971, 2077  Average = 2011.66 FPS/ 809 LBS
Underwood Ammo 124gr XTP 1774, 1759, 1718, 1756, 1766, 1765  Average = 1756.33 FPS/ 849 LBS
Underwood Ammo 125gr FMJ 1670, 1721, 1674, 1689, 1722, 1714  Average = 1698.33 FPS/ 801 LBS

Quote from: Intercooler on May 06 2018 09:28:50 AM MDT
Anyone know what barrel length Underwood rates the 9x25 on?

Yes, Underwood uses a 6" barrel for 9x25 and a 5" for 10mm.

I'm hoping to catch a DT sale on 9x25's

How has DT survived after years of greatly inflating their velocities? Why can't they just be honest 🤔