Guys this is bugging me, so i thought i would throw it out their so see if someone can help.
Ive always used 60g vmax and have loaded 75 amax using varget powder. 60g Grouping spot on at 2 hundred yards, 1 inch high at 100 yards, but the 75 a-max is way way way off the mark, 5 to 6 inches low at 200 yards, so obviously something is not right. Its the same as the 60 at 100 , 1 inch high, all the range wrok was carried with zero wind conditions and on a level eye to target. Now my twist is 1:8 which is well capable for the 75 a-max, varget powder used was 23g, minimum being 22.5 and max 25g according to hodgdon data, so i not even overloading the case. Any help would be appreciated. Is it the powder, ie to fast a burner, do i need slower burn rate powder.?