The model 19 being based on the K frame , which was originally designed around the .38 special round , I'd say that the guy who stretched that cylinder should be grateful that he does not have a piece of it embedded in his face.
As others have said it is probably a bulged chamber. You can also use the calipers and measure the outside of the cylinder. If it is a bulged chamber you most likely will get some weird readings. I just helped someone on the S&W forum with this problem 6 months ago, sold him my last cylinder that I had for parts.
S&W does not have any more cylinders but they can tell you which ones you can use as a replacement. Sometimes you can find replacements on ebay and a few other places.
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