The best replacement for 2400 is h110.

The best alternatives to 2400 are rated as following:
★★★★★  h110
★★★★★  1600 ram
★★★★★  0000
★★★★  36
★★★  1600
★★★  2500k
★★★  2133
★★★  0000 hours
★★  1866 ram
★★  0000 time
★★  3470
★★  296
★  3800
★  2600
★  1600 sat
★  16gb 1600
★  3450
★  2400s
★  1600 memory
★  2500
★  1333
★  8400
★  2133 ram
★  i5 2500
★  2200
★  200dg
★  7170
★  ddr3 1600
  alliant 2400
  3220
  core i5 2500
  1800
  honda 2000
  e5 2600
  i3 2120
  canon 9500
  7160
  eneloop
  2320
  i5 2400s
  blue dot
  denon 3805

Your alternative for 2400 is not listed? Suggest!
Speaking about 2400, one probably shouldn't forget about magnum primers.

Other search terms related to 2400 and their ratings are:
★★★★★ magnum primers
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2400
h110
1600 ram