Tried the 178 ELDX in my GAP 10 .308 20" bbl 1:11.25 twist, suppressed (Ultra7) using Varget. Best load I ended up with was 42.4 gr giving me 2510 fps, SD of 6 fps and 1/2" MOA at 200 yds. Used Lapua brass, 210M primers with a COAL 2.790 to meet mag requirements. With the suppressor, the load is a bit hot and leaves slight marks on the case head.