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A G17 etc enters IDPA in Stock Service Pistol, SSP, with a minimum power factor of 125. Common WWB runs around 1130 fps for a 115 grain bullet, PF 129.9. SSP was written FOR 9mm, pretty much.
An XD9 enters in Enhanced Service Pistol, ESP, (because it has a nominal single action trigger pull) with the same power factor.
9mm is just about perfect, cheap and adequately powerful.
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