Here we go again! Only one thing increases recoil and that is greater velocity of the ejecta or the same velocity and much greater ejecta. Pressure itself does not produce recoil! Pressure is acting in all directions inside the chamber forward and backward, up and down. Or for the physics challenged, if pressure of 11,000 psi causes all that recoil in a shotgun, how could we possibly fire a 60,000psi load from a rifle? Or does a .410 with a 13,000psi load recoil more than a 10ga with 8000psi load?