The best replacement for spc is 5.56.

The best alternatives to spc are rated as following:
★★★★★  5.56
★★★★★  sqc
★★★★  6.5 grendel
★★★  300 blackout
★★★  msl
★★★  ingalls
★★★  hcc
★★★  esso
★★  smpc
★★  cpl
★★  gens ace
★★  spc
★★  6.5mm grendel
★★  dabura
★  .223
★  7.62 x 39
★  7.62
★  243
★  6.5 grendel ballistics
★  6.8 spc ii
★  spc ii
  .270
  spcii
  30 rem
  458 socom
  grendel
  6.5
  7-30 waters
  5.56 nato
  .300 aac blackout

Your alternative for spc is not listed? Suggest!
Speaking about spc, one probably shouldn't forget about worldedit.

Other search terms related to spc and their ratings are:
★★★★★ worldedit
★★★★ waiver
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spc
5.56
sqc