You can order a Ruger specific pillar and the piloted cutter to install the pillar from Brownell's. I did that and used them to perform a bedding job on my Ruger build in 6.5-284.
The bedding job itself is not that difficult. The trick to the entire operation is properly drilling the stock for the pillar, which is best accomplished using a drill press and the piloted cutter that I mentioned.
I have had excellent results with my rifle. The bedding has proven to be very stable. I have gotten nice round groups with the majority of my test loads during load development.
If you properly pillar bed the action, free float the barrel, and pay attention to the action screw torque as previously mentioned I would expect you to see improvement.
The next step is the trigger. If all of that doesn't help, I would think you need to get rid of the factory barrel.