As a side note, I went shooting yesterday, not as a powder research activity, but as an enjoyment, accuracy and handgun/ammo compatibility.
Using my CZ 75 SP-01, with a 13lb (Green) recoil spring and OEM main.
Originally, I was looking to reload my 124gr Xtreme RN at 4.1gr with 1.12 OAL, but my brand new Lee Loadmaster Auto Disk wouldn't go to that exact weight, so I settled for 4.2gr, which the Loadmaster kept loading with an amazing consistency.
Anyway, my shooting with the 4.2gr was absolutely beautiful.
At 7 yards, groups were accurate and controlled pairs were very tight. Which makes me believe I have achieved a very good combination between the Alliant SP powder and my CZ.