Assuming you have a quality rifle, optics, rings/bases....what kind of impact would it take to throw off your zero and by how much have you experienced? I ask for two separate situations which occurred recently and I have yet to shoot the rifle to see what may or may not have happened. First incident....rifle leaned against a wall and fell over. The scope was not hit but the barrel hit another wall (drywall). It has a muzzlebreak and there is zero mark on the break. Second incident was walking through the woods with my rifle slung on my back. I ducked under a branch in the dark and stupid me forgot the rifle on my back. The barrel smacked the branch above me. Not super hard but it made a thud. Would these incidents make you worried your zero is off?