The best replacement for .45 acp is 9mm.

The best alternatives to .45 acp are rated as following:
★★★★★  9mm
★★★★  .45 gap
★★★★  .45 auto
★★★  10mm
★★★  .45 colt
★★★  .357 magnum
★★  .40
★★  .45
★★  .40 s&w
★  .357 sig
★  .45 long colt
★  gap
★  .44 magnum
★  .357 mag
★  .44 mag
★  .40 cal
  auto
  9mm ballistics
  .40 s w
  .50 ae
  .45 lc
  .45 s&w
  9mm parabellum
  colt .45
  .40 sw
  colt
  9 mm
  .40 acp

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.45 acp
9mm
.45 gap