My .243 Weatherby does the same thing. groups string left as the weight goes up. I have mine "zero'd" with 66gr. HP's, the 55's print 3/4" right of that, the 95's 3/4" left of that. I reset my turret zero's on my Diamondback for the 65's, and adjust 3 clicks either way, depending on which bullet weight I'm using. The funny thing is, they all print almost exactly the same on elevation. I think this is because the velocity for each given weight is at the top end of the range, nearly 4100 for the 55's, 3800ish for the 65's, and 3100 for the 95's.
If your turrets can reset, you might experiment and find an answer similar to what I did.
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