You did the right thing! Sometimes the hardest decesions are the ones that we remember the most. I took up bow hunting 5 years ago and have held fast to my rule of not shooting over 40 yards at an animal. Passed up shots my first two seasons because of it. I have no regrets, would have loved to have the chance to fill the freezer but losing an animal isn't worth that chance. Killed a nice bull my 3rd season at about 12 yards.
Congrats to you for doing it the right way.