Of course .22lr cases are only partially full - they were originally for black powder, where a compressed case full was only just enough to match what would now be regarded as a mild load.

I did see results of a 'detonation' many years ago. A 38 Special revolver cylinder had been stretched uniformly along a longitudinal line where the wall was thinnest, binding rotation past the cylinder bolt at that point. The owner recovered it by compressing the cylinder back to size in a pair of bored vice jaws, and continued to use the gun for years afterwards - though I don't know if he omitted the re - squeezed chamber, or even if he knew which one it was... ��

Nobel No.3 pistol powder was blamed - a very fast powder which rightly or wrongly had a bad rep in light loads.