I seem to recall reading in W W Greener that when choke boring was first introduced there was still a good many guns being made with low quality bbls consisting mostly of iron with very low steel content. Seems these soft bbls could not stand up to choking without bulging.
Personally I am not convinced that when that charge comes hurtling down the bore that there is not a "Check" applied to it as it hits the choke. Normally it is not so severe as to cause any problem, "But" if the bbl is too weak, too thin, too soft etc, then things can change.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra