The best replacement for 40 cal is 9mm.

The best alternatives to 40 cal are rated as following:
★★★★★  9mm
★★★  45
★★★  45 cal
★★★  10mm
★★★  357 sig
★★  45 acp
★★  357
★  357 mag
★  cardi
★  380
★  sam scar
★  9mm recoil
  9mm price
  357 sig ballistics
  40 s & w
  357 magnum
  .357
  40 s&w
  9mm what's better
  10 mm
  9mm ballistics
  9mm more accurate
  9mm cost
  9mm stopping power
  38 special
  .45 cal
  kardi
  9mm cal
  sam scarfo
  9mm ammo cost
  .357 sig
  .357 magnum
  9mm which is better
  loon
  9 mm
  9mm pistol
  38
  smith and wesson 40 cal
  9mm glock

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40 cal
9mm
45