Vern,
I've settled on a charge of 60.5 grains with the 150 Partition in my Model 70 (an O'Connor Commemorative Featherweight), slightly under the 60.8 grains Alliant lists as maximum with the Partition. Last week on a 70-degree day, it averaged 3013 fps with the chronograph 15 feet from the muzzle, and two 4-shot groups averaged a little over an inch.
