Alex, I\’m posting the below two trials in-line on your Alliant Sport Pistol thread. Slightly lighter loads by a gradient of 0.1gr and 0.2 gr.
*Although load variables are slightly different; and your CZ at 4.6\” probably has a much tighter chamber/shorter throat than my Beretta 4.9\” loose chamber/very long throat, it\’s interesting to see the results compared. Fairly predictable velocity as pressures ramp to published max.
*Yours at 4.4gr/1.100\” — 1091 fps
Mine: 4.3gr / 1.110\” — 1032 fps
and 4.2gr / 1.110\” — 993 fps
Observations: 4.2gr felt good but unsurprisingly, the ramp to 4.3 felt only slightly snappier but benefited by notably improved SD/ES, and slightly improved groups–a pattern I\’ve seen before with Alliant SP. (general forum precaution note: Alliant\’s published data shows 4.4gr max / generic 124 JHP @ 1.120\”)
Description: 9x19mm RMR Matchwinner Jacketed FP 124gr
Notes 1: Alliant Sport Pistol 4.3gr / COL 1.110″ /WSP/ Herters (These were Cabela’s S&B produced era brass) once fired cases
Notes 2: Beretta 92 (stock – early 90’s production)
Bullet Weight (gr): 124.000
Temp: 57F
Shots: sample size: 10 rounds
Average: 1031.70
StdDev: 15.09
Min: 1001
Max: 1048
PF: 128
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Description: 9x19mm RMR Matchwinner Jacketed FP 124gr
Notes 1: Alliant Sport Pistol 4.2gr / COL 1.110″ /WSP/ Win Cases
Notes 2: Beretta 92 (stock – early 90’s production)
Bullet Weight (gr): 124.000
Temp: 57F
Shots: sample size: 10 rounds
Average: 992.56
StdDev: 24.60
Min: 935
Max: 1018
PF: 123