The best replacement for 5.56 nato is .223.

The best alternatives to 5.56 nato are rated as following:
★★★★★  .223
★★★★  7.62 nato
★★★  5.56
★★★  .223 rem
★★  300 blackout
★★  5.56x45
★★  6.8 spc
★★  223
★  223 ballistics
★  7.62x39
★  .223 remington
★  5.56 mm
★  .223 wylde
★  7.62 x 39
  7.62 x39
  223 rem
  .223 ballistics
  5.56 x 45
  5.45x39
  5.56mm

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5.56 nato
.223
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