The best replacement for 28 is 20 gauge.

The best alternatives to 28 are rated as following:
★★★★★  20 gauge
★★★★★  30 inch barrel
★★★★  700c
★★★★  30 kanthal
★★★★  24 awg
★★★  26 shotgun barrel
★★  24 awg hdmi
★★  26 inch barrel
★★  26 barrel
★★  32 spokes
★★  sc 29
★★  d-28
★  32 kanthal
★  410
★  25 tires
★  26 shotgun
★  hd 28v
★  3 27
★  ah 64
  hp 57
  hd 28
  hd 35
  dana 35
  19
  25
  26
  martin d-28
  32 teeth

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Speaking about 28, one probably shouldn't forget about no career.

Other search terms related to 28 and their ratings are:
★★★★★ no career
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28
20 gauge
30 inch barrel