I just started load dev for my 243 imp. I rechambered a Tikka 243, 8 twist, 22”, throated for 108 eldm, H1000, Peterson brass. Fire formed with H4831SC and 108 eldms, 44 grns, on the lands. Velocity was 2815. Shot six today to test for pressure 49, 49.5, and 50 grains of H1000. I loaded 2 ea at...