The best replacement for bbs is pellets.

The best alternatives to bbs are rated as following:
★★★★★  pellets
★★  enkei
★★  volk
★★  hre
★★  oz
★★  bba
★  vossen
★  ccw
★  xxr
★  bbe
★  rota
★  steel bbs
  otr
  pellets better
  .12 gram bbs
  breyton
  white bbs
  .20g bbs
  zinc coated bbs
  oz racing
  zinc
  plastic bbs
  oz wheels
  king arms bbs

Your alternative for bbs is not listed? Suggest!
Speaking about bbs, one probably shouldn't forget about colt 25.

Other search terms related to bbs and their ratings are:
★★★★★ colt 25
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