The best replacement for 300 blackout is 308.

The best alternatives to 300 blackout are rated as following:
★★★★★  308
★★★★  223
★★★★  6.8
★★★  300 whisper
★★  30-30
★★  7.62
★★  6.5 grendel
★★  5.56
★  7.62x39
★  6.8 spc
★  7.62x40
★  whisper
★  300 aac
★  30 carbine
★  308 win
★  7.62 x 39
★  300 wsm
  300 win mag
  6.8mm
  5.56 nato
  458 socom
  50 beowulf
  300 fireball
  30 30
  .223
  6.8spc

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300 blackout
308
223