Your starting position is the Amiens railway gun. All you need know to calculate the range of the shot is the initial muzzle velocity, angle of trajectory and the gravitational constant.
Check the plaque for the following information.
Calibre = AB
Maximum range = CD
Weight of barrel = EF.G
Weight of projectile = HIJ
Rate of fire = KL
Barrel life = MNO
muzzle velocity = KDIEM.BCEK km/hr
angle of trajectory = EF degrees
gravitational constant = 9.80665 m/s*s
You must assume that the earth is flat and that the shell is fired in a vacuum, ie there are no other factors involved in the calculations.
The true direction of the shot is 269.1419 degrees.
So where is the shell going to land? If you decide to walk the terrain rating will go to 5 star.
You may think this cache is all in the realms of fantasy. However it is worth checking out 'Project Babylon' and the Iraqi supergun. Although this may have been all bull.
You can check your answers for this puzzle on GeoCheck
