my 26" barrel, 1:8 twist, TB7 suppressor, 140 Berger Hybrid bullet, 41.8 grains of H4350, Lapua SRP Brass, CCI 450 Magnum Primer, MV of 2801, SD of 2.7, ES of 9 fps, 10 shot group at 100 yards of 0.216 inch spread. Holds this grouping (< 0.25 MOA) out to 600 yards.
Primers impact your ES and...