What I find very unusual is that you are getting an 89 fps gain for a 0.5 gr powder increase (43.5 to 44.0 gr) and 186 fps gr with a 1.0 gr increase (43.5 to 44.5). I've never seen that with ANY powder in a .308 do that and it is not in line with Hornady data for that powder. Typical for a .308 is 50 - 60 fps per grain. You're seeing a 3x higher increase per grain - I don't think that's good and have no explanation for it.
