RWBlue,
I do not know what would be considered "good" Stdev. I think for small Stdev. with subsonic loads you have to weight each powder charge. Your best bet would be with an digital electronic scale.
My sub-sonic loads run like this:
165g Speer BT in front of 8.5 g AA#9: 1089 ± 6 fps
180g Sierra GK BT in front of 8.5 g AA#9: 1154 ± 54 fps
180g Sierra GK BT in front of 7.5 g AA#9: 1034 ± 52 fps
320pf
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