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Someone ran some 125gr Buffalo Bores and was getting around 1800 fps in a Coonan,
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I've seen some chrono results of 1500 from a 4" revolver, so unlikely that you're going to see much more than that from a 5" auto. The auto barrel includes the chamber, so a 5" auto is effectively the same as a 4" revolver, with a bit of pressure loss from the gap.
You can drive a 135gr bullet at well over 1400 from a 5" 10mm, so not much to choose.