So I had this old 20ga #6 shell sitting around. It was so old that I really didn't trust shooting it, although I'm sure it was fine. I thought...hmm, I'd like to keep the old cardboard type shell, but should probably remove the primer to make it safe to keep around. Sooo..
I took my trusty Remington 597 .22 rifle and set up about 75 yards from the shell, which was firmly planted in a pile of dirt. I lay in the prone position, and set my crosshair on the top of the primer. I slowly squeezed the trigger, and the shotgun shell, to my surprise, silently flew out of sight. Upon arrival to my target, I found this, and only this remaining: (See Attachments).
See! No primer! I know my Rem 597 is a tack driver, but I think this was probably a lucky shot, hehe.
*Note: I wouldn't recommend doing this, especially at close range. It is a good way to get a darwin award. I've seen someone shoot a loaded 30/30 shell with a BB gun and have the brass fly back and hit them square in the chest. They thought they were going to die, but were lucky to just get a good bruise.