I just came across what I consider to be a miracle cure for my inaccuracy issues at the range. It's called Modern Spartan Systems Accuracy Oil (comes as a grease, as well), and, per the description on Amazon, "Improves accuracy and tightens shot groups about 90% of the time ." (Which reminds me of the quote from "Anchorman" - "They've done studies, you know. 60% of the time, it works every time.")
In reality, I doubt it's really that much better than the oil I currently use, but it sounds fantastic.