I also have a Ruger 30-06 RSI with a Williams Fool Proof peep mounted to the side of the receiver. Had to have the holes drilled and tapped for it though. I've not had a scope on this rifle as it appears to interfere with reloading with short eye relief. Probably a long eye relief scope would work just as well, but with the peep sight mounted, it pulls up with the eye natural aligned with the center of the peep. I've not done much bench testing with it, but plan to this winter with a Chrony chronograph and some hand loads. I don't expect to see minute of angle with the peep site on it, but do expect it to shoot within 2-3" at 100 with it. Hopefully a bit better, but my old eyes just aren't what they used to be.