As promised, I have some new data for Winchester WSF.
Same variables as above EXCEPT for the stated powder and 3 samples:
All values are in fps
(7.1 gr WSF)
Std Dev: 12
(7.3 gr WSF)
Std Dev: 9
(7.9 gr WSF)
Std Dev: 11
Powder meters very well. All groups were very tight as can be seen by the very low Std Dev's. It does burn a bit on the dirtier side, just likes its cousin 231. Case appearances were normal, and there was no evidence of flattened primers.
I'm not through experimenting with this powder. I do think it is capable of higher numbers. Until next time!