Did you crank down the middle action screw? Doing so will torque the action and will cause the rifle to throw fliers.
Ruger makes excellent barrels btw. I m thinking something else is going on.
I’m in agreement your cleaning regiment. Put the cleaning rod away and put a proven scope on it. Try some different loads.
Some rifles will take 10 rounds to settle down after a cleaning. I had a 7mm rm that looked like the bore was copper lined. If you cleaned it. It would take 30 rounds to settle down and accuracy to come back.
