Did some more chrono work yesterday, and wanted to share my results with the class.
Gun is a Sig P226 USPSA(4.4" barrel), weather was approx 60*. Shot strings were 15 rounds.
W-231 powder, MG 115gr jhp bullets, CCI primers.
5.1gr @ 1.150 oal
High: 1226fps
Low: 1197fps
Spread: 29
Average: 1213fps
Power factor: 139.4
4.8gr @ 1.135 oal
High: 1164fps
Low: 1120fps
Spread: 44
Average: 1137fps
Power factor: 130.8
4.8gr @ 1.120 oal
High: 1186fps
Low: 1142fps
Spread: 44
Average: 1186fps
Power factor: 133.8
Hope this helps someone!