Few things for you.
Depending upon speed, the 77gr bullets may or may not stabilize. But they will gain stability as they travel, also known as going to sleep. Stability is based upon length and RPM, bullet weight only as a side effect and dependant upon construction.
The fact that they all group differently is due to harmonics, one of the reasons there is no single "load" that will work for everyone. How the gun recoils, barrel stress, etc. First I would make sure things are tight, and throw that tin-can scope in the ocean. FWIW, I've NEVER had luck with ANY fusion ammo in any rifle.
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