I load 75 A-max (I still have about 1500 put back!) with Varget for a single shot Savage target rifle (loaded way to long for any magazine!) and get 3" at 1000 yards. For SAMMI length rounds I prefer H332, H335, and WW748. Primers really need to be "Best Quality", CCI BR-4 or Rem 7 1/2 really shine for hot loads, and Fed 205M for medium to just be low Max pressure loads.

Your photo looks like a nice round group, for elevation that means a decently consistent velocity!

Ivan