Look at the Boyd's. There was a young man at the long range hunting match we were in, He had his Ruger 77 in one. It was sweet!!
As far as action, Boyd's website should say.
Great idea too, go to Brownells.com, get a pillar bedding kit. Lighten the trigger to 3lbs, should be a great improvement. I think the heavier wood stock with a Decelerator recoil pad should take some of the "bite" out of the Maggie. Make sure you keep the correct length of pull.
Have fun and post pics when done!!
"I ain't here for a long time, I'm here for a good time"
King George Straight