The best replacement for 22 is 9mm.

The best alternatives to 22 are rated as following:
★★★★★  9mm
★★★★★  17
★★★★★  223
★★★  24 frets
★★★  380
★★★  24 inch monitor
★★★  23
★★  24 bass drum
★★  glock 23
★★  177
★★  22 magnum
★★  17 hmr
★  22lr
★  24 monitor
★  remington 597
★  25
★  22 mag
★  24
★  23 inch monitor
★  556
★  shotgun
★  .17 hmr
★  22-250
★  24 fret
★  27 stethoscope
★  air rifle
★  .380
  177 pellet
  marlin 60
  24 barrel
  .22 lr
  .17
  pellet gun
  10/22
  sigma 10 20
  19
  25 caliber pistol
  17 caliber
  f35
  springfield xd
  .25 caliber
  25 caliber
  su
  35
  marlin model 60
  glock 19
  f-35
  177 air rifle
  24 inch rims
  glock 22c
  22 long rifle
  mig 35
  tokina 12 24
  title 5
  ak
  tokina 11 16
  25 acp
  410
  glock 21
  .22 magnum
  22c
  27 inch monitor
  f 35
  19 monitor
  ruger sr22
  yf 23
  glock 17
  20 bass drum
  capri 22

Your alternative for 22 is not listed? Suggest!
Speaking about 22, one probably shouldn't forget about barrel band.

Other search terms related to 22 and their ratings are:
★★★★★ barrel band
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22
9mm
17