"One stupid and ignorant question. If the bullet is slightly larger and less pressure, might the bullet get stuck in the barrel?
Now that could be very dangerous. "
Not a stupid question at all.
The difference in bullet diameter isn't that much -- .003 to .005 (.357 nominal for .38 Special, .361 nominal for .38 S&W)...
But .38 S&W bullets tend to be, in my experience, quite soft so MAY be more prone to leading.
As for getting stuck in the bore, I wouldn't be concerned about that at all.
Maximum pressure for the .38 S&W is about 14,500 psi, which isn't that much different from the max pressure for .38 Special, 17,500 psi.
But, those are max pressures -- working pressures can be some thousands of PSI less.
Additionally, there are many .38 Special loads that develop pressure bands very similar to those of the .38 S&W.
But, to stick a bullet in the bore of a .38 Special you're generally looking at the equivalent of a squib load -- probably in the 5,000 psi range or less.
So, I'd say that there's no real worry about sticking a bullet if using any decent factory load.