I think the silly myths regarding evil military projectiles may have started with the dum-dum nonsense. And the myths just won’t die.
The evilness of the 5.56 can perhaps be seen as America’s own equivalent to the dum dum myth.
Here is another excellent write-up about dum-dum bullets, with some other interesting links on that page, some of which may help to highlight the (historical) contrast regarding gun culture in the UK versus US.
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