45 ACP relative size steel blank? Edit: (Polish AU-65 cattle killer)

This balnk is semi rimmed. About 45 ACP relative size.
HS = 21 and 74 upside-down. So I assume Polish 1974.
Length 28mm
Base 10.76mm
Rim 11.27
110 grains.


Joe, it’s a Polish blank cartridge for the AU-65 cattle killing device. Red code indicates a strong load used for cattle with a weight of 600 Kg.



And it was made from 7.62x39 case.

do you had a picture of this device ?

thank in advance for your response

Here are the exact same heastamps, but obviously different loadings. The extractor groves seem to be different and the base measurements are different . 0.45 mm smaller on the cattle killer.



Thank you.


The cattle killer cases are seized down in a die which reached down to the extractor groove.

EOD - how would sizing down the case to the extractor groove
effect, or cause to “disappear” the extractor groove bevel? Not
challenging that these are made from 7.62 x 39 cases, I just
don’t understand the result in light of the fact that I have full-length
reseized, as a reloader, thousands of rifle cases. as well as doing
some cartridge-conversion reforming (for example, making 7.62 x 39
cases from 6.5 mm Carcano Norma cases) with no similar result.

Are you sure these are not purpose-manufactured cartridges, perhaps
using some portion of 7.62 x 39 manufacturing steps?

Again, not saying you are wrong, just trying to understand the processes
used if they are converted from 7.62 x 39 cases.

John Moss


Upon closer examination, it does appear that the metal was forcibly pushed down and thereby eliminating most of the bevel. There is also a little burr left by this process.


Joe, Your reply forced me to go downstairs and look at a 7.62 x 39
cartridge. I just looked in my Collection of DDR cartridges, (a little
bit of a “Cheat” side-line I have). The regular cartridge in the comparison of
extractor grooves on this thread maybe a little different. Firstly, it has less
of a bevel that I first thought. In comparison to the cattle-killer, I guess it
looked large to me. Secondly, when I looked at my DDR 7.62 x 39s, of
which I have over a hundred, they have even less of a bevel. I had never
noted before how narrow the bevel is on those rounds compared to most
pistol and rifle cartridges I am familiar with. I still can’t picture completely
a process that pushes the cartridge down in such a way as to almost
eliminate the bevel, without crushing the case, but thanks to your explanation,
I can see that it does not have to be pushed down very far to all but eliminate
the bevel; not nearly so far as I had originally pictured.

Thanks. I learn something new, even about my own collection, every day.

Forensic - no need for an explanation. I think the path Joe put me on in
examining the question has supplied the answer.


John Moss

John, as Joe said the whole case body is being resized to the smaller diameter, this also affects the extractor groove. Like in this case the upper edge here the rim turns into the case body becomes a sharp edge.

We saw similar operations by the Finns when they made their first 7.62x39 cases by resizing 7x57, 7.92x57 and .303.
Then just the extractor grooves were newly cut on the necked down cases.
A lot of work but when resources are short and no case drawing machine is on hand this can be done.

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Very nice information. Thank you.



This is part my articles (translate) about this ammo (in writing)


This cartridge is called under the official nomenclature as: “Cartridge for stunning slaughter animals” with an indication of the purpose of this cartridge depending on the adopted weight category of animals for which it is intended.

It was only at a later stage that he made metric markings, or rather attempts at some grade. It occurs in several variants depending on the author or institution publishing this data. These markings are:

  • 11x28,5 SR
  • 9,5x28SR
  • 9,4x27SR

The first marking comes from the publication of Leszek Erenfeicht in the magazine “Mundur I Broń” (trans.“Uniform and Weapon”) on the production of polish 7.62x39 caliber wz. 43

The second designation is found in the publication of Grzegorz Franczyk about polish small arms ammunition and on the portal Naboje.org.

The third mark appears on Municion.org and is probably from the ECRA (European Cartridge Research Association) file.

Which marking is correct? Well, in my opinion, none of the above. The cartridge should, if it already adheres to the general rules for naming small arms, be marked:

- 11x30SR

Why exactly? Well, the caliber designation refers to the diameter of the “chamber” in the slaughter apparatus AU-65. This value is of course rounded. However, the scale length parameter refers to its technological length before creasing into an asterisk (of course also in rounded form). In addition, the nominal name does not have to correspond to the actual dimensions of the cartridge in this case.

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Lenght cartridge crimped (not used)

Diameter on head (before crimp)

Diameter on rim

and original box

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