Hi
its a 223 Rem with 24” Heavy Stainless 1:8 bbl,
Tried different bullet weight from 55, 62, 68 and 75 grains, factory rounds to handloads, all ammo will group sub moa, however the 55gr will group 3” right away from the POI from the other bullet weights, elevation is in line with other weights , still grouping sub moa though, any thoughts? Thanks