Sure, I adjust the seating depth on the rifle. But this is a pistol. The pistol is a semi auto and needs to function out of a magazine. If you go too long on a pistol, it can mess up the angle of feeding and jam up. I've seen guys mess with it, and then go back to book COAL for that bullet to get reliable feeding. You will not gain much, if anything, playing with the COAL in a 9mm pistol.