Make sure that the guard screw holes are not too tight.
Use inletting screws to push the action out in a straight line.
Tap each one with a proper hammer with the stock upside down in a padded vise ie HS vise blocks.
Be very care full about hitting the barrel only as you can crack a stock like that.
I have put the bolt in to pull up at the same time as I hit the barrel on a slightly padded surface but I much prefer the inletting screws .
Glenn