You say you were shooting the other guns just fine. What were they? Is the 7mm mag a heavier recoil than you're used to? Is the gun comfortable to shoot? Fits you well?


Take another shooter with you. Try each of the different 5 loads for a 2 round group each and compare the results .... if you both get large groups it's probably something about the gun, scope etc, and not the shooter(s).