Historic record setting rain for our area finally stopped and wife gave me a break from long list of post-rain "honey do's" to do some range tests with Alliant Sport Pistol.
As indicated on post #84, Sport Pistol granule is
cut extruded powder like N320 but with thinner slices that are slightly smaller in size than larger W231/HP-38 flattened balls -
https://www.thehighroad.org/index.php?threads/new-alliant-sport-pistol.816514/page-4#post-10559773
As expected, Sport Pistol meters very well and consistently dropped charges with less than .1 grain variance from Pro Auto Disk.
.43 = 4.2 gr
.46 = 4.5 gr
.49 = 4.8 gr
As I mentioned on post #93, smallest
.30 disk hole of Pro Auto Disk dropped 10 charges of Sport Pistol from 2.90 gr to 2.94 gr weighed on Gemini-20 digital scale with most of charges being 2.92 gr to 2.94 gr. This is VERY consistent powder charge variance! https://www.thehighroad.org/index.php?threads/new-alliant-sport-pistol.816514/page-4#post-10560187
Load data for 4" test barrel supplied by Paul was used to develop initial test loads -
https://www.thehighroad.org/index.php?attachments/sport-pistol-initial-loads-022717-pdf.235357/
Speer 115 gr TMJ RN Sport Pistol 1.135" OAL 4.8 gr 1164 fps
Speer 115 gr CPRN Sport Pistol 1.135" OAL 5.0 gr 1171 fps
Based on Pro Auto Disk drops, 4.2/4.5/4.8 gr were decided for load development.
While 1.130" OAL chambered RMR 115 gr FMJ in KKM/Lone Wolf conversion barrels for G22, 1.115" max length was needed for G23 LW barrel with almost no leade and 1.110"-1.113" were used for final OAL as loaded on Pro 1000 with .378" taper crimp for .3555" sized bullets -
https://www.thehighroad.org/index.p...re-sized-the-same.818806/page-2#post-10567453
Chrono data from Glock 22/KKM conversion barrel and Caldwell chronograph:
RMR 115 gr FMJ 1.110" OAL (78 F):
4.2 gr: 1131-1108-1097-Error 2-1071 fps - SD 24 - Average 1101 fps
4.5 gr: 1188-1108-1142-1170-1184 fps - SD 33 - Average 1158 fps
4.8 gr: 1196-1199-1241-1218-1227 fps - SD 18 - Average 1216 fps
Initial 25 yard 10 round shot groups with 17" Just Right carbine, Bushnell 6-18x50mm scope and UTG bipod (using mixed brass and Fiocchi SP primer):
Second 4.8 gr group (blue circle) showed a lot of promise and will be doing more testing at 25/50 yards along with chrono testing with Glock 23 and 9mm conversion barrel.