I chrono'd 12 rounds at 3.8 grains and 12 at 4.1 grains(was going for 4.0, but the powder bar settled in at 4.1) out of my 686 last night. From the 3.8 load I got an average of 711fps, 27.09 SD and an extreme spread of 102. The 4.1 load got 757 average FPS, 25.2 SD and an extreme spread of 89. I need 791fps for 125 power factor. I would like to be in the 825-850fps(130-135PF).
My Solo lot is 1930, which seems to be the slow batch. I am loading on a 550 with Dillon dies except the seating die(Redding Competition). I am using mixed brass and Federal small pistol primers.
My questions to start are...
Published loads stop at 4.0 grains of Solo. How much can I push it? Is it crazy to try 4.3 and 4.5?
What can I do to tighten up my standard deviation and extreme spread? My 9mm minor load with titegroup have extremes of 30-50 and standard deviations of 10-12 over 30 round strings.
I would like to avoid titegroup because of the heat that it generates.
Thanks!