The best replacement for 300 is 7mm.

The best alternatives to 300 are rated as following:
★★★★★  7mm
★★★★  308
★★★  600 dpi
★★★  30-06
★★★  338
★★★  history
★★★  charger
★★  gladiator
★★  dodge charger
★  troy
★  300c
★  6.8
★  immortals
★  30 06
★  300 rise of an empire
★  338 win mag
★  need for speed
★  bdk
★  divergent
★  270
★  pompeii
★  sata 600
★  302
  400 stainless steel
  sata 150
  70 300
  600
  72 dpi
  isovue m 300
  spartacus
  ninja 650
  tamron 18-270
  cadillac cts
  hyundai genesis
  308 caliber
  tamron 28-270
  million
  7 mag
  non stop
  gamon
  150
  lexus rx 330
  buick lacrosse
  mx 200
  80 400
  450
  phantom
  338 winchester magnum
  persia
  310

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300
7mm
308