The best replacement for 300 aac is 5.56.

The best alternatives to 300 aac are rated as following:
★★★★★  5.56
★★★  300 whisper
★★★  6.8
★★  6.5 grendel
★★  6.8 spc
★★  300 blackout
★  whisper
★  6.8spc

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300 aac
5.56
300 whisper