You should be able to shoot the 150s thru 200 grain bullets equally well out of that rifle. The point of impact change is probably due to a combination of bullet weight, velocity and barrel harmonics but could also be any number of things. Check your action screws and your mounts and scope screws. Also check to make sure that your barrel is not touching the stock and that the tang is free floated as well.
A rifle is much like a fine musical instrument and needs to be tuned. Hand loading is the best way to achieve this to find the correct burn rate powder and velocity to achieve the same barrel harmonics from shot to shot with any given bullet. A slight change in any of these things can have significant effect on group size.
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