BigBlock:
First and foremost I am glad that you are okay. It would be easy of most any of use to lapse into the same extent of false security as you did as shoot without protection.
I recently posted about a load that I created for Speer Hot Core, 90 grain hollow points, which said load would completely penetrate the steel plate that support the train track to the tie when hung at 100 yards.
The last time that I fired on one of those steel plates was from a benchrest @ 100 yards distance. The first 10 or so rounds fired flawlessly. On the final round however, the copper jacket "ricocheted" off of the steel plate, and returned from the target, through the air and smacked me square in the forehead which sufficient force as to leave a welt.
Upon viewing the target, I noted that the lead core was penetrating the target but the copper jackets were lodging in the steel, and were turned inside-out in the .277 caliber hole. All of the other copper jackets were still in the target with the exception of one.
My point, even distance between you and the target, and even having the target hanging 3 feet off of the ground is not sufficient assurance that no bad event will happen. With that, I started making certain that I never deploy and firearm without eye protection. A helmet? No, but a cap with bill, i.e. a baseball cap works miracles for the small stuff. I have since been struck numerous times by flying cases, etc, and have yet to be injured because of the eye protection and baseball cap.
Be safe,
Doc2005