I once met an old Machinist. When he learned I had guns he related this story:
Once he read about silencers, and said that it was simple enough so he made one. He then put it on his single shot .357 Maximum.
He proceeds to fire a .38 special hand load, it was a very quiet pop.
Then he fires a .357 Magnum load, and it is noticeably louder.
He touches off a hot .357 Maximum load and the can explodes.