Cram Cannons Cram cannons serve as an artillery in game, and hit rather hard, (if they hit that is.) Unfortunately, cram canons are rather unrealistic, what do I mean by that? There max gauge of a cram cannon is 2000mm, a maxed out cram cannon can fire shells bigger than small cars! Cram cannons are a little more tricky to measure, as they are based on a pellet system were shells become more potent over time. Thankfully a cram cannon can simply be loaded without the pellets. Firing a 1500 mm cannon, the phys boat flew back with a speed of what I assume was 50 m/s, (This is an exceptional large uncertainty.) With the kinetic formula, we get an kinetic energy of 449,425,875 kg m/s. (cram cannon added 43666.3 kg.)