The best replacement for .40 is 9mm.

The best alternatives to .40 are rated as following:
★★★★★  9mm
★★★★  .45
★★★  .357
★★★  .357 sig
★★  10mm
★★  .45 acp
★★  .45 caliber
★  10 mm
★  .45 recoil
★  .45 ballistics
★  .357 magnum
★  9mm price
★  9mm recoil
  .380
  .38
  9mm ballistics chart
  9mm ammo cost
  45 acp
  9mm handgun
  9 mm
  sig 229 .40
  9mm cost
  9mm caliber
  9mm ammo price
  .40 s&w
  45
  357 sig
  .357 mag
  .45 pistol
  .45 cal

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.40
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