Yes, I'd consider a 20MOA base, or a pair of Burris Signature Z rings with 20MOA inserts if you plan on keeping the setup you have. According to Bushnell that scope should have 60 inches of adjustment @100 yards, you should not have to put on that much elevation to sight in at 100.
If you have access to a different scope I'd try that first. If you still have to put on that much elevation at 100 yards then in my experience it is likely an issue with the mounting system, either base, rings, or both.
huntin1
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