i recently bought a remington 700 tactical with the 20" barrel. i bought it used and shot it a couple of times. i have since been reading about break in, here on the forum. i have no idea if the previous owner did it and i didnt do it. is there a way to do it after it has been shot, or, am i stuck with what i have. .750 5shot group at 100, with factory stock. 150gr. rem. corelokt