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Is there any other cartridge from which brass can be formed into 5.7x28?
How close dinensionally are the 5.7x28 and the old 5.7 Johnson?

Karl
 

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Could not find any case spec's on the Johnson except that it was a 30 cal carbine round necked down to 22 cal.
 

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No. There is not that I know of, or have read about in all the forums that I visit concerning reloading that have any information on the 5.7X28.

If there was, I am sure that someone whould have jumped on it by now as there are many reloaders out there that would love to use virgin brass, even if it was modified, over once or twice fired brass.

The specs on the 5.7X28 are here:

 

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Esteves:

Hope I did not offend by posting the diagram. I did not know who had produced it, only that I had it on file.

It is good to know though where it did originate from.
 
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