What type of base are you using? I seriously doubt it's the scope, especially as you say that grouping is awesome. I've seen bore sighting be dead on or waaaaayy off. Are you actually bore sighting, or just looking through the barrel? If the latter....far from accurate.
Did this rifle have a scope on it previously, or is it a new rifle? If new, it is possible, that the the holes are improperly drilled in the receiver, but that's pretty rare.
Use a 1 piece base with 20MOA if you plan on going long distance. I personally never put much faith in the MOA insert type rings as they only make contact in two small places,
where the 1 piece base is graduated 20MOA throughout it's total length. Two piece bases just stink.
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