I do about a dozen tang safety and MKII rifles a year.
The ONLY way to bed a TIMBER stocked Ruger is to add PILLARS at the same time the recoil lug is done, then, and ONLY then, bed the tang and sides of the action. Because of the centre screw, all bedding should be done with surgical rubber holding/pulling the action down.
I bed the recoil lug tight with the pillar, Brownell's sell a good pillar kit cut to the correct length and 60 degrees of the front screw. I bed/install the front and rear pillars at the same time as the recoil lug. Once this is all set up, then I do the tang and under the sides above the mag cutout, this stops any bending that can occur from the centre screw.
With the Brownell's kit, you will need to cut a groove in the front one and 3 grooves in the rear one, a set of centring cones, and modified all thread/nuts to hold the pillars central, these DO NOT hold the action for bedding or put pressure on the stock, the rubber tubing does this.
Cheers.