I want to make sure about this....
If I shoot a PCP's pressure down too far I run the risk of having a pellet jam in the barrel. In fact, it's inevitable. Now AFAIK, that's the only problem I should encounter, yes? (Actually, I ought to notice the increasing downward curve of the pellet before that happens.)
Because I'm not 100% certain about that statement, I don't want to experiment with one of my rifles unless I get validation from folks here more knowledgeable than I. That means most of you.