Raxmei wrote:Correct in principle, but the effect of overcharged rounds seems exaggerated. Might be AdMech conservatism, or maybe those last two increments are just really big.
It's broadly consistent with supercharged rounds fired from real life artillery, I think. The limit of how much powder you put in a supercharged shot is defined by how much the barrel can take while reliably not exploding, after all; you can't expect it to be repeatable several dozen times.
There might be intermediate levels (10% more powder, half the barrel lifetime), but for game mechanic purposes those settings are irrelevant or likely to be unbalancing, so they wouldn't come up.
Raxmei wrote:Found out this computer has a scientific calculator. 814 m/s horizontal component, 19s flight time, and earthlike gravity gives you a vertical component 93 m/s and an elevation of 6.5 degrees. Again, a bizarrely flat trajectory.
In the 4th Edition Guard codex, the default version of the Basilisk had a low-angle carriage and could only do direct fire. To get indirect fire you had to pay extra. So those flat trajectories may just be because they're using field artillery carriages, without the high elevation you can get from a howitzer.
mount an Earthshaker on a howitzer carriage, and for a lot of situations it's eminently reasonable to do so, but that doesn't mean they always will be.