What? How did you get 500 hrs in skyrim? I think you might mean 50, right, because if you say 500 that means you have spent at least like 10 hours a day since release date...
On topic: I have hit dragons in the wings with melee/magic (I think so), don't know if arrows work too.
I work from home and only need to clock 3-4 hrs per day to get paid. When i say work i really mean i get paid for doing essentially nothing. In fact right now i'm literally getting paid for doing nothing as a project has just finished and i'm on retainer for the next one.

I had 4 characters total. 2 have since been deleted, 1 due to the game overwriting my save when i started a new char, the other deliberately by me as the save screwed up. Every time it loaded i was stuck in place, unable to move. The one that was deleted by the game had approx 40-45 hrs and the one that i deleted had around 106 -108 hrs.
I have two left. My original char that, although screwed with unplayable fps, i am reluctant to delete for sentimental reasons and my new version of that char. This is what it says on the saved data screen in the xmb for the original char: Skyrim, 17/12/2011, 8:10, 11mb, Christian Coldbane, level 42, playtime: 262.21.03
New version: SKYRIM, 2/1/2012, 20:58, 8870kb, WINDHELM, Christian Coldbane, Level 39, Playtime: 122.52.54.
Even taking the lower estimate for the deleted saves thats around 530 hrs. I love this game WAY too much and have WAY too much time on my hands
EDIT: I must have deleted the most recent save for my original char as i know it had 266 hrs played and a few more mb in size. I can't remember doing that though. Also meant to say that i just tried shooting a Dragon in the wing and the arrows went straight through again.