After making some tweaks to the gas system (no more ejector marks) and shooting between 50-300 yds, this load end up being the most consistent (repeatable)
CCI 450 Primers and H322 Powder 31 Gr = 3522 FPS (20 shot avg with an SD of 6.3)
Here's a pic of the setup for my grandson with a Sightmark Wraith Mini Thermal, Ti can and sitting in a FATBOY tripod.
