Well, that’s mildly interesting! I love revolvers, but — 9mm in a revolver has never made much sense to me. It’s rimless, meaning you need moon clips, and the gun ends up being about 4 ounces heavier than the .38 Special +P version. That’s a pretty hefty difference, going from 13.5 to 17.5 ounces. Ballistically . . .
the bullets are basically identical in diameter and largely identical in weight. 9mm has a tiny velocity edge over .38 Special +P, but not a significant one. 9mm +P is a little higher in velocity than .38 Special +P, but again, not night and day. I would say that the bad guy likely wouldn’t know the difference between whether he’d been hit with the .38+P or the 9mm.
I guess the thing that’s most disappointing about it is that it’s the same price and weight as the .357 Magnum LCR – and that’s way, way, way more powerful.
I don’t think there’s much reason to do ballistic testing between a .38+P and a 9mm, from the same revolver my guess (and it is only a guess) is it’s gonna be a case of pretty much identical performance…