Happened to me many years ago . I was with some friends at a Shooting Range testing some Reloads in a large Case . Seems it was about 30 Degrees . I don't remember any double click , but I got several hang-fires in a row . One of my friends switched Primers and Reloaded some of my empty Cases with my Powder and no more problems . It was long ago and I can't be sure but I think I was using CCI BR Primers and switched to his Remingtons.
I've had hang fires with both of those. I use Federal 215 for almost anything now.
