To summarize the info we have gleaned from the late Mike Willard @ Swampfox: 9.4gr LS under a 200gr XTP = 1240fps (+) in G20 w/ AFTERMARKET FULLY SUPPORTED barrel ONLY. 10.0gr LS under a 200gr XTP = 1325fps in G20 w/ AFTERMARKET FULLY SUPPORTED barrel. Primers used were CCI300 NON mag primers. The charge should be reduced for use in a longer 6" barrel otherwise pressure will be too high. Per The late Mike W. Standard disclaimer applies. Do your OWN slow, careful workups with new brass. ALSO, it's my opinion that the 10.0gr load probably averages over 37.5k. Just my guess.