Mythbusters shells homes in CA
Story here, and check out the video. The report is that they were trying to ascertain the cannon projectile's velocity (which can easily be found from charts), but it sounds more as if they were trying to measure its penetration, and aimed way too high. (A 5 degree elevation is all it takes to bring the ball down around a mile away). It must have been one heck of a big gun -- the holes are said to be 8", which might be consistent with a 32 pounder (bore diameter 6.41").