3BM42 and 3BM42-2

Intresting lenght.
Try reducing 100mm off and you are more correct about that penetrator lenght
It is about 730-750mm long rod.
First about100mm is steel and rest is DU rod.

That tail section where Fins are attached , If I’m correct it is not anymore part of that DU penetrator. while having that included it is over 800 long.

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Also worth noting that it is designed to sacrifice first “useless” part of penetrator on ERA’s and let rest of that “true penetrator” DU rod pierce trough armor.
It is not complete solid rod, it is designed to “break” in parts to defeat armor behind ERA’s.
If you got solid rod, it starts deforming and losing energy , but simplest way to describe it, think it as tandem heat shell. First part sets off era, and second part comes trough.

There’s a nice simulation how that round works.

Screenshot 2026-06-28 092304
The penetrator is 842 mm long. That’s without the tip and without the fins. This has already been proven.

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No offence but those are looking really awesome proof.
Now If you could find something more trusthworthy instead trust me bro , I drawed these on paint I would appreciate it.

But even if that is real, it measures are still shit.
Du rod ends on that thick part on bottom not that small tail section where that is drawn. ( least what I know. ) And secondly there is still that 100 some mills sacrificial steel tip, and that would leave us about 700mm DU rod

Even if you exclude the fin attachment, the penetrator is still about 800 mm long. In fact, this figure appears in many sources, and it’s the correct one.

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I still dont see lenght of penetrator

image
Nice sources btw

And that picture is M829A4, after finding original photo.
But yet again , we can find this.
image

And that 790mm is including that 100-130mm steel tip, depending on source how long that steel penetrator is infront of DU rod

And lastly, your photo and how it was calculated is shown in this pic. And also that ammo is indeed M892A4

Now, if you want to continue, get some proper information and provide link on your screenshots since they are indeed cherrypicking from what an intresting sources

Screenshot 2026-06-28 105720

Okay, let’s not get too far off topic. In your opinion, what is the overall length of the M829A3 penetrator? And what are the lengths of the tip and the fin assembly?

That is still not proving anything about m892A3.

I allready told you what I’ve found about it.
Now start providing some links on that M892A3 , and how long it is.

Now here is the twist, there is none unclassified documents about it.
And according to patents and pics of that, it is estimated to have 630mm-700mm DU rod and 100-130mm steel tip, so depending on source full lenght is 740-830 including steel tip.

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image
See? You don’t even know the basic dimensions. The overall length of the M829A3 and M829A4 penetrators is exactly the same as the M829A1’s—984 mm. Once you know the overall length, it’s easy to calculate the length of the penetrator itself. So let’s avoid making unsupported claims and stick to the facts, okay?

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And that is not lenght of penetrator.
That is lenght of full casing.
So lets stick on known facts

Exactly. That’s what I mean. Once you know the overall length of the APFSDS, you can calculate the length of the rod itself.

Oh god…
You cant be serious IF THAT COMPLETE SHELL IS 984mm , it doesnt mean that PENETRATOR IS SAME LENGHT.
What you are claiming in there.

image
As you can see, 684mm DU rod in A1, despite having total casing lenght 984.
So how was the facts.

Watch out, he’ll pull out some facts from SteelBeasts.

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Okay, now let’s stay calm.

We know the overall length of the APFSDS round, and we have a cutaway image of it. That means we can calculate the length of the penetrator itself—and that’s exactly what I did. I used the overall length of the round and calculated that the penetrator is 840 mm long.

Now let’s think about it.

We know the overall length of the APFSDS round.

So tell me: what is the length of the tip, and what is the length of the fin assembly?

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Yeah, I cant wait.

It is amusing that he thinks that APFSD is as long as in casing…

Or is DM53 penetrator also over 900 long :D

Is that an article from ChatGPT?

That’s not what I said. I’m talking about the complete APFSDS round, not the cartridge case. We know the overall length of the round, and we have cutaway images of it. From those, it’s possible to estimate the penetrator length. If you disagree, then tell me: what do you think the lengths of the tip and the fin assembly are?