I have been following discussions about +P in older alloy-framed revolvers with great interest and, in particular, this thread on "The Test" is very interesting. Although I'm aware of the cracked frame issue, I have never read or believed it was a result of over-pressure ammo and never heard that until reading these discussions. I have always read and heard that if there is a problem with +P in older alloy revolvers, it is the possibility of top strap stretching, not frame cracking. I hope this test provides some light on that issue. With the increased thickness of a K-frame topstrap over a J-Frame, however, I am not postive this test will shed any light on +P through older airweight J-Frames. Still, a welcome addition to the information pot by Osprey.
Edited to add: Sorry for re-plowing ground already tilled by DC7.