If it's to be an "international" gun, I'd suggest something chambered for a load you can actually find outside the United States. That invalidates .45 ACP, .40 S&W, and .357 Magnum for the most part.
If you're playing Mr. Secret Agent, you probably want handgun ammunition you can get without attracting attention. That pretty much leaves .22 LR.
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Sometimes it’s nice not to destroy the world for a change.
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