4 mm CETME Projects


#1

As with the 3 mm caliber rounds, these spanish cartridge projects of 4 mm caliber were also designed by CETME around 1972 and never gone beyond the drawing board.

    • Project No. 1: 4 x 31,2 mm
    • Project No. 2: 4 x 27,2 mm (different from final 4 x 27 mm cartridge)
    • Project No. 3: 4 x 22,3 mm
    • Project No. 4: 4 x 23,45 mm
    • 4 x 31 SR (Günther Voss Patent projectile)
    • 4 x 22 mm (Günther Voss Patent projectile)


#2

Fede,

Fantastic drawings! That 4 x 22.3mm looks like one of the recent “short magnum” rounds in small scale… Don’t think I have seen the use of volumetric descriptions on cartridge drawings before. That level of detail and the fact they never went past the design stage makes those ripe for a modern solid model rendering to “bring them to life”.

Thanks again for the great drawings you have been sharing.

Anyone interested in seeing “virtual versions” of Fede’s drawings?

Dave


#3

Yes, please!

Hans


#4

Here is the “Project No.3” 4 x 22.3mm as shown in Fede’s drawing next to a .303 British for scale. Little bitty thing…

And in a different scale…

The model is complete per the drawing. Very quick to build with all the detailed dimensions! We can get creative with a headstamp if there is any idea what it should be.

Edited to add section view.

Dave


#5

Dave, wonderful model!

The 4 x 27 mm CETME produced cartridges bear no headstamp or 4C SBT 74.


#6

Thank you, Dave, incredible!

Hans


#7

These are the 4 CETME my collection.



#8

davrib,

Thanks for showing those examples of what I assume are the 4x27mm “final” cartridges Fede mentioned. Could you further describe or display the first image of what looks like a very flat pointed projectile? Would not seem to be a champion contender in the ballistic coefficient competition!

Here’s the final installment on the 4mm project…

Questions:

  1. Are the angled vent holes for Berdan priming common? Would think that would make for a much more complicated case forming process.

  2. Are the 4.44mm and 3.30mm primer diameters used elsewhere or are these special to this project?

  3. Note the #4 Item has no anvil shown as typically used on Berdan primed cases. Intended for a Boxer primer perhaps? Then why no central flash hole and typical dual flash holes for Berdan priming?

Hope the models are of interest and if anyone would like a particular view or combination shown, feel free to drop me a PM.

Dave

Edited to show final group photo and add question on Item #4.


#9

See final group image above.

Dave