This accurately covers the area: ask your recruiter / someone else you might have met, and unfortunately it's very possible you'll never get a response or get something vague like "they were looking for someone with more experience".

About setting the record straight: you'll never "overturn" a rejection; it would set the wrong precedent for every other hiring decision and also would create a very weird work environment. It's just never worth the trouble. Reapply in a year, many places will give you a totally fresh attempt (which I think is actually a bit charitable).

To echo other anecdata: I've been mildly confronted by previous interviewees who I've rejected and it was always very uncomfortable. The decision is almost never personal, and in one of these cases I actually voted for hire, but was overruled.