I can think of three ‘drops’. First one, I was climbing a wood ladder into a box blind when the ladder broke. I fell onto rocky ground and landed on the gun and scope. The Leupold 4.5-14 did not lose zero. Second one, I left my Varmint rifle in the running Kubota, and vibration caused it to fall out of the Kubota (not loaded) and land on the road. The Leupold 6.5-20 was knocked out of zero. Third one, I had my new Tikka T1X propped in a corner and my cat decided to use it to rub on. Down it went on the hardwood floor, landing on the scope, but the Leupold 4.5-14 didn’t lose zero.
My general rule of thumb, in a case like those above, is just to assume the scope zero is off.
