That is certainly interesting if it’s true. I’m genuinely curious to see a link to a source with that information, as I’ve been looking and haven’t turned up anything reliable.

That being said I think it’s important to note that if the bullet found in Faulkner was in fact .38 caliber, ballistics was still unable to link that round to Mumia’s gun. The burden of proof should have been on the prosecution to prove beyond a reasonable doubt that the bullet came from his gun, and the common denominator of a .38 caliber round doesn’t do that.