Hiya Coyote56 and thx for the thread, agree with operators suggestion and advice. When you see your local dealer again, remind him of his anything goes advice,and that a forum member suggested that he is a real wanker.
If your gun didn't have an owners manual,you can download one and I recall for your platform they say use +p sparingly so open to your interpretation, and they suggest never using +p+ and there rationale is posted as well.
One has to practice some with their HD ammo and much of it is rated +p.
The only exception I'm aware of is the cz sp-01 tactical, which was designed for LE and military and rated to shoot Nato 9mm, the ratings are very similar to +p. I simply can't afford to shoot it all the time,even if the guns tolerances are made for it.Be well.