+1 there as that's what the shot timer and targets confirmed for me. But, as HV sez, especially with the Glocks, there's a lot of versatility to be had - such as aftermarket .40 barrels.
FWIW, a cop at range earlier this week said he'd read an article by the head honcho at Bar-Sto Barrels (one of which I have for Glock 29). He said of all the testing they'd done, 10mm was the most accurate semi-cartridge ...
Now if the operator can just do his part ...
