Get your mount, and set it on top of your action - it might be flush, and require nothing. It might be "not flush" also. If you suspect it's not, put the rear bolt in and tighten it down. If the front of the rail isn't touching the action, then it's not flush. Switch, and do the same - one bolt in front, tighten, see if it's sticking up off the rear of the action. if it's not flush, you'll have to bed it. Use JB, seriously. Tighten down the front, and use the JB under the rear, set it up loosely with the screws in the back. Use black shoe polish as a release agent on the screw threads, and in the screw holes in the action, and in the top of the action where the JB will touch. Let that joker cure for days. The JB will harden, and become part of the rail base.
I'm pretty positive there's a writeup on SH about it.