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The actual chronographed velocity will nearly always be lower for the consumer with a mass produced gun than the lab with a pressure test rig.
PV (Pressure & Velocity) test barrels are of minimum chamber and bore dimensions so as to give the maximum pressure for the combination, so you don't overload a standard gun. The high velocity is just an advertising bonus.
Some revolver calibers are tested in a vented barrel to simulate the cylinder gap, some are shot in long straight barrels. No way to know if they don't tell you.
Also, your 110 grain bullets are striking low not because the velocity is lower than advertised, it is because they are lighter than standard. They don't induce as much recoil and barrel lift while still traveling down the barrel as a standard 158 grain bullet does.
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