I've shot .38 Super out of a .357 before. Worked just fine, but the rims very readily slip under the extractor star, tying things up.
Nominal base diameter on a .38 Super is .383, which is a bit larger than the listed nominal base diameter on a .357.
But I had no problems dropping them into the chambers on my Model 19.
That said...
I agree that it's really not a great idea to try it, especially not in a .38.
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