This might be of interest I use to shoot a lot of F class and found that a 70 FPS drop in velocity was 1 MOA drop in POI in 6mmBR 6.5x55 and .308 should be the same in other calibres,
If your rifle shoots 1/4 MOA it could be a problem if you shoot 1000 metre competition matches but for a hunting rifle 25 fps ES is not to bad,
Try your loads at the longest distance you are likely to shoot an animal if the group is within the kill zone you are ok.
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