My Ruger SS .30-06' is a 2 MOA gun with a handload. 2.5-3.0 MOA with factory ammo. The worst shooting centerfire rifle I've ever owned. I know some Rugers shoot well but this one does not.
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Have you tried tweeking it any? Float the barrel, tune the trigger, bed it, or check you action screws so you aren't binding the action.