Hot new cartridge - the 9mm K-Boom

[CLT65]

We went to the range today, and while I'm there I just can't seem to help picking up a little brass when I see it. I found a couple of unusual cartridges.

The first one is the occasionally seen 9/40 reverse bottleneck. Amazing that it actually shoots, but I expect accuracy is sub-par. The second one is clearly the fancy new 9mm K-Boom.

Funny thing, I didn't see any blood, severed digits, or blown up gun bits or pieces laying around. Surely something this bad would leave a mark somewhere, right?

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[Local Loader]

Damn, about all I can say is that it was likely fired from a glock that someone really didn't care about and I'm sure at some point there was likely a puddle on the ground after this happened. Why would you do this?

 

[CLT65]

It was just on the ground with all the other fired brass. One has to wonder.

I check the brass I pick up pretty close, so I've seen some odd things over the years. One time I found three pieces of ruptured 9mm brass in the same area with a bunch of empties. They weren't ruptured nearly as bad as this one, but I sure wondered how someone could have three of them do that and keep going.

 

[Howard1955]

Maybe a reloader was trying to duplicate this ammo?

 

[solv3nt]

Surely something this bad would leave a mark somewhere, right?

At a minimum, their shorts.

 

[P7M13]

Back when I used to try and save every piece of brass, I had bottle neck splits, shoulder separations, one case head separation, and splits on pistol cartridges. On almost all of those, I did not notice when i fired, except for the case head separation - that had gas venting.
The 9mm KB shown, might it have been fired from a PC carbine like a CX-4 Storm in 40?
In my experience, with a KB in a pistol, if it impacts the shooter, there's no soiling one's self. Pain tends to heighten focus and cause adrenaline to flow.

 

[Hemlock]

In my experience, with a KB in a pistol, if it impacts the shooter, there's no soiling one's self. Pain tends to heighten focus and cause adrenaline to flow.

So, what you're saying is there's a spike in the "pucker factor."

 

[Certaindeaf]

Shot out of a fotay?

 

[Mikej]

We went to the range today, and while I'm there I just can't seem to help picking up a little brass when I see it. I found a couple of unusual cartridges.

The first one is the occasionally seen 9/40 reverse bottleneck. Amazing that it actually shoots, but I expect accuracy is sub-par. The second one is clearly the fancy new 9mm K-Boom.

Funny thing, I didn't see any blood, severed digits, or blown up gun bits or pieces laying around. Surely something this bad would leave a mark somewhere, right?

View attachment 1805819 View attachment 1805820

I've been under the impression these last 11 years of scrounging 9mm brass that the unique mark on the primer can only come from a Glock? Am I wrong? And some months ago finding three pieces of 9mm at the range with a distinct BULGE right where the above case blew also had that mark.

 

[PiratePast40]

I've been under the impression these last 11 years of scrounging 9mm brass that the unique mark on the primer can only come from a Glock? Am I wrong? And some months ago finding three pieces of 9mm at the range with a distinct BULGE right where the above case blew also had that mark.

My 9mm PCC often bulges the brass at the base when shooting suppressed. I've noticed the same thing with others shooting PCC suppressed. I now run all of my brass through a case gage before loading. All sorts of problems are possible if you don't make sure the bulge is removed or the brass discarded.

 

[MacReady]

Looks suspiciously like an unsupported Glock chamber blow-out doesnt it? Thankfully all that kinetic energy is directed down the magazine well and away from the shooter. Usually. I'd be looking for a magazine spring/baseplate on the ground out there just to satiate my curiosity.
"Its not a bug its a feature!"

 

[Mikej]

My 9mm PCC often bulges the brass at the base when shooting suppressed. I've noticed the same thing with others shooting PCC suppressed. I now run all of my brass through a case gage before loading. All sorts of problems are possible if you don't make sure the bulge is removed or the brass discarded.

That's no good. In this day and age with KNOWING that the unsupported portion of the barrel causes bulged brass it's irresponsible as hell for companies to make barrels like that.

And, the Trade-Mark "Glocked" primmer?

 

[bcp]

49ers were looking for gold in the ground

40-9ers were looking for magazine parts on the ground.

Bruce

 

[Deavis]

Bump firing an AR-9mm with out of battery detonation looks exactly like that.

I mean… thats what my friend said.


*edit - not with that striker mark though

 

[Spitpatch]

Armchair quarterbacks all giving the unknown experimenter no benefit of the doubt.

Clearly, he was engaging the common practice of allowing the propellant to expand (obturate) the rear skirt of the bullet to engage rifling not precisely matched to the sized bullet.

He merely applied this practice outside its scope of soft lead, and was trying to make 9mm "obturate" to something around .40. A measure of economy, no doubt.

Give the guy a break.

 

[osprey]

I know a guy that successfully shot a 223 round out of a 6.8 spc. He may even have the resulting case still. Kind of like throwing a hotdog down a hallway.

 

[ageingstudent]

We went to the range today, and while I'm there I just can't seem to help picking up a little brass when I see it. I found a couple of unusual cartridges.

The first one is the occasionally seen 9/40 reverse bottleneck. Amazing that it actually shoots, but I expect accuracy is sub-par. The second one is clearly the fancy new 9mm K-Boom.

Funny thing, I didn't see any blood, severed digits, or blown up gun bits or pieces laying around. Surely something this bad would leave a mark somewhere, right?

View attachment 1805819 View attachment 1805820

Perhaps shot out of a steel framed duty sized pistol that just shrugged off an out of battery det instead of sploding to bits.

 

[Saladfarmer]

Having seen when a gal came into my LGS and asked why her 9mm brass looked just like this to the owner...
she showed us the pistol and it was a .40 short and weak glock as I recall.
Also seen the same thing when a buddy did the same and forgot he didn't put his conversion barrel in his g27 and
shot 9 out of it.
So probably both, Glock and 9kb in 40sw chamber.

 

[CLT65]

I should mention, the two empties in the photos were picked up off the ground at the same range, but were definitely not fired in the same gun.

The first was clearly fired in a .40 S&W chamber, but the second was definitely fired in a 9mm chamber. The case mouth is correct for 9mm, not blown out at all.

Curiosity got me, so I checked the ruptured case in my 9mm barrel. It sticks out about .040" more than a good round, making me think it was either fired in a very sloppy chamber, or perhaps slightly out-of-battery. The firing pin indentation sure looks Glock to me, but would one ever fire out-of-battery? Or maybe it was just seriously overloaded.

Makes me wonder how often this sort of thing happens. I've been shooting and loading my own for 35 years, in a variety of different rounds, sometimes pushing the limits and making mistakes (mostly long ago), and I've never had a blow-out like this or damaged a gun.

 

[P7M13]

I should mention, the two empties in the photos were picked up off the ground at the same range, but were definitely not fired in the same gun.

The first was clearly fired in a .40 S&W chamber, but the second was definitely fired in a 9mm chamber. The case mouth is correct for 9mm, not blown out at all.

Curiosity got me, so I checked the ruptured case in my 9mm barrel. It sticks out about .040" more than a good round, making me think it was either fired in a very sloppy chamber, or perhaps slightly out-of-battery. The firing pin indentation sure looks Glock to me, but would one ever fire out-of-battery? Or maybe it was just seriously overloaded.

Makes me wonder how often this sort of thing happens. I've been shooting and loading my own for 35 years, in a variety of different rounds, sometimes pushing the limits and making mistakes (mostly long ago), and I've never had a blow-out like this or damaged a gun.

View attachment 1806571

Even cartridges have a LOL moment. Look at that smile!