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Old March 26, 2010, 09:30 AM   #42
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Join Date: July 20, 2005
Location: Indiana
Posts: 10,167
I have not looked up any tables but suspect a short bbl 10mm becomes essentially a .40 S&W
No, not really. Double Tap's 200grn 10mm will still break 1200fps from a G29's abbreviated barrel while the same firm's 200grn .40 S&W only gets 1100fps from a 4.5" barrel (I suspect the handgun is a G22).

The relationship between the two cartridges is a lot like that between the .357 Magnum and .38 Special: while the 10mm isn't achieving its full potential from a short barrel, the power gap is large enough to begin with that it's still beyond anything the .40 is capable of.
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