The 5.56x39 was the 7.62x39 case necked down to accept standard 5.56mm bullets. While Russia did not adopt it as a military cartridge, the 5.56x39 succeeded as a small game cartridge chambered in the Toz-23 and Vostok sporting carbines. In the United States, 5.56x39 brass produced by Sako became the base case for the highly successful .22 and 6mm PPC benchrest cartridges, which still give challengers a run for the money.
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The 5.56x39 was the 7.62x39 case necked down to accept standard 5.56mm bullets. While Russia did not adopt it as a military cartridge, the 5.56x39 succeeded as a small game cartridge chambered in the Toz-23 and Vostok sporting carbines. In the United States, 5.56x39 brass produced by Sako became the base case for the highly successful .22 and 6mm PPC benchrest cartridges, which still give challengers a run for the money.