Everybody is trying to be nice about this, but I'll cut to the chase.
It's crap.
Stick with major manufacturers premium JHP.
There's also a tendency for smaller ammo makers to attempt to get market share for themselves by bringing out some flavor of Super Kewl Magic Bullet.
Often sold with wildly exaggerated claims of effectiveness (because new magic!), and even the occasional dark hint about use by Sooper Seekrit Skwirrel Black Ops Ninjas.
This is often a clue: any ammo with either above is usually overpriced Derp.
"You win 100% of the fights you avoid. If you're not there when it happens, you don't lose." - William Aprill
"I've owned a guitar for 31 years and that sure hasn't made me a musician, let alone an expert. It's made me a guy who owns a guitar."- BBI
Got me thinking too. “Served over seas” covers a lot of ground. The tooth to tail ration in the modern military is like 13 or 14 support for each trigger puller. Regardless of what he did “over seas” it doesn’t mean he knows jack shit about terminal ballistics. All it means is he showed up, used what “they” gave him. He had no say in the matter.
My dogs know when it’s time to eat but that doesn’t mean they could tell you how to build a watch.
The only impressive effects I have seen with tumbling bullets were the result of loading a Chinese 5.8 bullet into a .22-250 case used on a smallish quadriped. It was pretty much disemboweled. Can't find the pic on the ballistics studies site right now.
This was the original goal with M-16 ammunition, or so I have read. (Hence the original 1 in 14 or so twist) It never seems to work out with rifles, hard to see how tumbling would work all that well at 1/3 the speed of .22ish rifle.
But "exotic" ammo never dies, it just goes away until folks forget it didn't work, then it comes back with new packaging.
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It would appear to be FMJ promoted by and sold to the people on the "low information" side of things.
Ask yourself this; How many Pros like Larry Vickers, Ken Hackathorn, etc are carrying this stuff.
Nobody.