For the price of a primer just pull the bullet and dump the powder and fire the darn thing. They are kinda loud so stick the end of the barrel in a hole in a cardboard box 2 feet square or so. That will keep the wife and the neighbors off your case.
I just don't think that a primer is worth the risk of trying to get it out, and if I did get it out there is no way I would use it again for a new load, so what is the point?
Just my honest opinion, take it for what it is worth.