If it was me I'd work all your brass so it's as consistent as you can get. Then re work the load. Re working the load will help you get to know the rifle and you will know that it's the best load for your rifle, But first check your rail and rings and such for loose screws. Seen that happen to a lot of rifles that just start opening up.
Scope ,rail and rings are all tight that's the first thing checked. Its funny i loaded up a couple rounds with .5 grains less powder and they are alot closer than the original load. 5/8" center to center as opposed to 1" center to center. Both loads are hitting almost in the exact spot on the target .
With the 67.5 grain load the first shot is bulls-eye. 2nd shot is 3/4" high and 1/2" right of 1st. 3rd is 3/4" high and 1/2" right of 2nd.
With the 76 grain load 1st is bulls-eye. 2nd is 5/8 high and 1/2" high of 1st. And 3rd is 5/8" high and 1/2" high of 2nd.

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I'm going to buy new brass and start all over again at the beginning.