The best replacement for fx 6300 is fx 8320.

The best alternatives to fx 6300 are rated as following:
★★★★★  fx 8320
★★★★  i3
★★★★  fx 8350
★★★  i3 4130
★★★  fx 6350
★★★  i5 4670k
★★  fx 4300
★★  i5 3570k
★  i5 2500k
★  a10 6800k
★  i3 3220
★  i5 4570
★  a10 7850k
★  i5 3350p
★  i3 4330
★  i5 4430
★  i5 4440
★  a8 6600k
  6100
  fx 4170
  760k
  fx 6200
  4350
  fx 8120
  i3 4340
  intel i5
  8320
  a10 5800k

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Speaking about fx 6300, one probably shouldn't forget about gtx 760.

Other search terms related to fx 6300 and their ratings are:
★★★★★ gtx 760
★★★★★ gtx 660
★★★★ r9 270x
★★★★ 780
★★★ 7850
★★★ 7870
★★ 7770
★★ r9 280x
★ gtx 770
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fx 6300
fx 8320
i3