The break is in a tough sport but it is repairable.
First I would remove the bedding at the tang and the rear action screw. This will all you to flex the stock a little easier to line it back up and work fiberglass resin into the crack.
Once the bedding is removed and you’re able to get the crack to close up you will be ready to apply epoxy. Do not use a fast setting epoxy. Use Acraglas or Devcon 2 Ton clear with 30 minute set time.
What you are doing is stabilizing the stock so that you can reinforce the damaged area.
Apply wax to the outside surface to keep any epoxy overflow from sticking. Work the epoxy into the crack and then clamp up tight. Using strips of wood covered with wax paper between the stock and clamps with help distribute force and not mar the surface of the stock.
The next part is going to be the hardest part. You will need to remove wood from the inside of the stock, wher the crack is. You will need to remove as much as you can and then replace it with epoxy and fiberglass cloth or mesh. This will reinforce the area and make it stronger then before.
You will need to pick up a brass screw with wood threads. This screw needs to go across the area between the magazine well and the rear action screw. You will need to cut the screw so that it fits into the stock. Use epoxy to bed the area with the screw. If you add fiberglass flox it will make the resin in the bedding area much stronger. If you don’t have any flox, I have some I can send you.
Now you should be at the point where bedding the action is all that is needed. Use epoxy with flox added ant this will help to reinforce the repair.
Now doesn’t that sound easy?
Break down into steps.
#1 remove bedding
#2 fit the crack so that it lines up and closes
#3 get clamps ready, wax stock.
#4 epoxy the crack and clamp
#5 remove wood from inside where the crack is
#6 epoxy in fiberglass cloth or mesh
#7 cut threaded Rod from screw and epoxy in place
#8 bed the rear of the action
Take your time, ask questions as you work, I’ll answer them for you. And post pics of the work.