It shouldn't be an ammo problem as the 55gr round will fire out of just about any twist rate barrel. If you zero at 100yds, there should only be about 1.5"-2" drop at 200yds. You should easily be able to keep them on paper at 200yds.
However, you will see a drop of about 8" moving back to 300yds though.
Assuming that everything on the rifle is OK, was it possible you were shooting at 300yds and not 200?
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