Based on the figures above, I have made up 6 rounds of 20gr and these will be my "summer" woods load. If 20gr in warmer weather gave FPS above those of 21gr in cold weather, what would happen if I had to fire the 21gr rounds in equally warm weather. It could be anywhere north of 1360FPS. Even for my Ruger, from 4.2", no thank you!!
Given that there is a clear discrepency with my most recent chrono readings and that the previous time, I seemed to have had a pressure spike as shown by a sudden leap in FPS between 20 and 20.5gr (not seen this time), I have also made up 10 x 19gr and 10 x 19.5gr, just to see what they read.
If 19.5gr gives my velocity of 1300 or so, I'll settle for that all together.
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