I have had very good results, both in precision and in velocity, with Vihtavuori 3N37 and Hodgdon HS-6.
They are both very useful powders for reloading medium-to-high pressure semiauto handgun cartridges.
3N37 may be a little dirtier burning than others, but it meters really well in my powder measure, and yields very high velocities with (relatively) low pressures. Excellent precision.
Ditto for HS-6, except it is cleaner burning
[This message has been edited by Albert Z (edited March 06, 2000).]