JMette, I can not agree with your assessments here. Velocity is a result, and while some correlation exists, correlation does not imply or equal causation.

Especially in this case, because as Bob Atl said, pressure is pressure, and is not velocity specific in any instance. This is easily evidenced by the same loads being able to produce 100fps more or 100fps less in different barrels. So while velocity will be a metric for the median, to either side of the median is danger.