New Ruag Action SE SXF vs Geco Action Extreme

Two new ammunition from Ruag which also own Geco, they have a similar shape and expansion, they are both made of monolithic material, but the Ruag Action SE SXF is destined to the authorities with more piercing power (capable of piercing SK1 ballistic vest). The Geco Action Extreme is for the civilian market, and have a different color - silver bullet and dark-silver case.

The Geco Action Extreme bullet is weighting 7 g/108 grs (you can see the performances on the link bellow), but I didn’t find any information about the weight and specifities of new Ruag’s Action bullet.

Ruag Action SE SXF!31/345/0

Video and test of the new Geco Action Extreme 9mm Luger 7 g/108 grs (only in German):

The new Geco Action Extreme looks similar to the new Norma Monolithic Hollow Point (MHP) 9mm Luger 108 grs, too. Norma is also owned by Ruag, like Geco.

If the Norma MHP are the same as those of GECO then this test is interesting:

I love the flash when the void collapses and the smoke oozing out afterwards :-)

FWIW in the highspeed video that is actually steam not smoke escaping via the bullet channel.

That Norma video with the gel test:
At 5:13 one can see the cavity collapsing and when the cavity walls are hitting “zero position” again there is a flash visible (also in some other scenes).

How can that be explained?

The flash effect is called sonoluminescence.

Fede, thanks a lot!
Had to do a web search and found it.
Interesting that the effect is still not completely explainable.

I’m not sure where the sonic element plays a part in this phenomenon. I’m doing some research on synthetic ballistic gel tests at the moment, and what seems to be happening is that when the temporary cavity collapses rapidly the adiabatic type compression creates the heat which ignites a fuel, which is reportedly (from internet research) the volatile oil component part of the synthetic ballistic gel. My flashes seem to last around 100-200 milliseconds. After the combustion of the flash, the cavity instantly darkens with carbonaceous sooty deposits, and then the material being blown out the entry hole does seem to be (at least the majority of it) the products of combustion. One of my tests didn’t seem to reach a high enough temperature to ignite when the cavity collapsed, and a mass of small gas bubbles radiated out through the gel block originating from the centre of the collapsed temporary cavity. Very grateful for any pointers towards any sources of info / articles about what’s going on during these impacts!

The flash of light seen in the video.


A couple of YouTube videos:

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Thanks Brian! Some interesting stuff in there.