168 Amax and Ballistic Calc
I have been using the 168 Amax in my .308 with 45gn Varget, Norma brass, Fed LR primers. My velocity as chrono'd was lower than hoped (2635 in a 22inch barrel Rem 700sps), however ES and accuracy was great so stuck with the load.
I sited in at 100m, and then went out today at 446m. After several groups at this range, I found that I needed to adjust the velocity up to 2700fps in my ballistics calc for everything to line up correctly. I had made an effort to ensure all other parameters were correct.
I was wondering, is this a normal amount to have to tweak a calc by? I realise I need more testing at other ranges/conditions but wanted to know if I am on the right track?