One simple suggestion is to be careful to be consistent with how you hold or rest the forearm when shooting. The rest or support hand presses against the forearm, which presses against the barrel. Inconsistency here can cause inconsistency downrange. I know it to be true from experience with my #1As.
Another idea is to send the rifle back to Ruger. I sent a #1A back due to inaccuracy and they replaced the barrel, replaced the trigger, and re-worked the forearm hanger. They actually cut part of it off, modified it, and welded it back together! Dang thing shot good too, and there was no charge.
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