I should add the one I tried the oil bending on was beech and in excellent condition other than the warp in the upper portion. Draws were excellent. I just pulled the rifle out of the safe and it's remained straight for close to two months now. Based on my limited experience with this it's crucial to have some sort of jig set up to hold the forend properly and that allows you to bend it past the desired angle to accommodate the inevitable tendency to bend back after the clamps are removed.
Ridolpho