Dan, I didn't blow anything up with it but scared the crap out of myself one day with it. I tried coloring some bones one time in my mason jar vacuum chamber. I had been using it with rit dye and decided to try it with PP and left a bunch of salts from the rit dye in it when I added the PP. I put a vacuum on it and went to work on something else. Don't think it was long after I was hearing a hiss and finally spotted what it was. The tube had sprung a leak and the jar looked like it was boiling. At that time I thought I had made a bomb, I grabed an old wrag and got the jar out of the shop as quick as I could. Guess the PP was attacking the salts, I don't do that anymore.
Knut, I haven't heard of anyone trying to make shear steel but a number have been making different types of wootz. I've been looking for more shear steel but I've struck out so far....