The best replacement for 10mm is 45.

The best alternatives to 10mm are rated as following:
★★★★★  45
★★★★★  .40
★★★  357
★★★  45 acp
★★★  357 sig
★★★  .45
★★★  9mm
★★  44 mag
★★  40 s&w
★★  40 cal
★★  13mm belt
★  40
★  357 magnum
★  .357
★  44mag
★  45 super
★  .40 s&w
★  .40 cal
★  13mm inzer belt
★  .45 acp
★  460 rowland
  .357 magnum
  41 mag
  357 mag
  18mm
  38 super
  15mm
  45acp
  8mm flooring
  41 magnum
  50ae
  .45 ballistics
  .40 caliber
  .44 magnum
  .45 cal
  40 s w
  .357 sig
  40 caliber
  45 auto
  11mm
  45 long colt
  15mm central heating
  454 casull
  44 magnum
  .45 caliber

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10mm
45
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