En route the yesterday, I was given a descent into my Initial Approach Fix “N12345 cross POINT at or above 4500.” I was in and out of the clouds throughout my flight and was excited that perhaps the bases were near 4500. I was looking around and kind of aiming for the base of the next cloud when I look down and see my altimeter at just over 4000. “Oh no! That’s outside of my 300’ window of leeway!” I immediately climbed back up and continued at or above my assigned altitude. No “Possible pilot deviation,” no number to call, not even a “verify altimeter setting.” Am I going to get a letter from the FAA? Am I going under investigation? Am I doomed forever? (Ok, I know it isn’t that bad…) No loss of separation occurred, no danger to safety of flight as I was in VMC when it occurred, and while the computer probably caught it, nothing was ever said. I know that many “busts” are never elevated above the controller, so could I skate by with just a lesson learned? Should I file an ASRS report? All these questions and more have been running through my head.