Both XTrooper and Alk8944 make very valid points. I tend to agree with XTrooper's theory about where the reported damage comes from, but I also tend to agree with Alk8944's questions about why take the chance.

I think the damage came from super hot, high velocity loads that simply put too much energy into the forcing cones. I don't think that the light weight bullets themselves do any harm at all. Does anybody really think that a powder puff .38 special load using a light weight bullet would hurt anything? I don't. But then again what is the point?

I'm pretty sure that the remaining 38 rounds you have would do no harm but I wouldn't make a habit out of it over the life of the gun.

JMHO