AND one more reminder:

This is largely a theoretical exercise. No reason to get worked up. Why would anyone WANT to shoot .38 S&W out of a .38 Special in the first place?

These days, .38 S&W is harder to find, and it’s more expensive, with lower performance. Plus the residue issue. Nothing to be gained

Remember that many re-imported BSR’s were reamed out to take .38 Special after the war.