The SAAMI spec bullet diameter for the 9x19mm is 0.3555"-0.003", i.e., 0.3525 - 0.3555"
The SAAMI spec groove diameter is 0.355" + 0.004", i.e., 0.355" - 0.359"
The answer to your question depends on your specific gun, as we do not know its exact bore diameter. I have fired many lead bullets having a 0.357" diameter from the 9mm with good performance. I seriously doubt you will see any discernible difference between 0.355" and 0.356" bullets and you will have to learn that for yourself.
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