https://www.youtube.com/watch?v=DksiPtL1AgM
Using the game: SQUAD as a reference has some realistic mortar/artillery systems where teamwork is used to help the mortar dial in to the correct position.
Using an artillery computer is too easy for a "Conflict" game mode.
Charge Muzzle Velocity Range
Primary 73 m/s 180–520m
Charge 1 110 m/s 390–1,120m
Charge 2 137 m/s 580–1,710m
Charge 3 162 m/s 780–2,265m
Charge 4 195 m/s 1,070–3,080m
Charge 5 224 m/s 1,340–3,850m
Charge 6 250 m/s 1,700–4,680m
ArmA 3/ACE have set good precedents for Reforger:
Mk6 mortar charge velocities: 70, 140, 200 m/s
Sholef charge velocities: 153.9, 243, 388.8, 648, 810 m/s
Seara charge velocities: 114.8, 130.1, 148.8, 170.0, 193.8, 221.9, 255.0, 289.9, 329.8, 374.0, 420.8, 476.0, 543.2, 629.0, 715.7, 816.0 m/s
Needs to be complemented with solid map tools (like ACE, but better? Need to determine bearings and distances), finer map grid figures, and ballistic tables.