Now then, who wants to hear how these loads performed? I don't have a chronograph, and I was limited to shooting at an 8" round target at 25 yards. All loads fed, fired, and ejected flawlessly. Test gun was my M&P Shield.
4.0gr was obviously the lightest recoil, and almost definitely subsonic. 3 of the 5 shots on paper, no real grouping.
4.2gr was a little louder, but the recoil was about the same. Only 2 hits on paper, but I've got a feeling that was my fault.
4.5gr was probably the best mix of accuracy and recoil, and recoil was lighter than WWB factory loads. All 4 of 5 on target, and 3 of the 5 spent cases landed IN my bucket, on the other side of the station, 6 feet away!
4.7gr was obviously the hottest of the bunch, but it wasn't unmanageable. 3 of 5 on paper, no obvious grouping.
Good stuff!
Have you decided on which load you're going with? I like the idea of staying at least a couple tenths under max with a pistol load. If you're putting them together on a turret or progressive press, the charge can be a little high w/o getting you into trouble.