Im betting scope/mount issue or the barrel didn’t get torqued on? No barrel shoots like that and shifts 7” as it breaks in You can load 2 different loads, one at the very bottom end and one at absolute max and they aren’t going to be 7” apart even if there is 400 FPS in velocity difference. Also never seen a barrel shift 7” squeaky clean to filthy dirty. This is assuming the 7” shift is at 100 yards? Did it happen all at once or walk up the target in a few shots?