Get a wooden stock. Remove the butt plate and bore a 3/4 inch hole about 6 inches into it. Fill with molten lead and let cool.
Replace butt plate, add a recoil pad if you wish.
The felt recoil will be greatly reduced. Only use 2 3/4 inch shells, and stay away from anything that says "magnum".
Why does the lead ease the recoil? Makes the gun heavier?