as i said, i'm not sure how exactly it is calculated in-game and, unfortunately, the editor is pretty cryptic on that as well.
anyway, from what i understand the projectile speed you mentioned is only the minimum muzzle velocity. if with the chosen firing angle there's no firing solution, i.e. the
shell would land short or overshoot, the initial projectile speed gets increased (or decreased) by a set increment and the firing solution recalculated until it matches.
now the part i don't know is how the firing angle is chosen. there is a min/max in the editor and some algorithm that gets the lowest possible angle needed to avoid shot blockers, but the actual angle seems to be random and to vary from shot to shot
what this means is that depending on the angle, the velocity (and as a result the time of flight) of the projectile is adjusted and can therefore vary between shots.
Are you talking about the projection of of velocity on X axis or the real velocity?
Because from what I have seen projectile velocity is dependent on projectile attributes and not guns attributes and a such I do not see how angel of fire would effect it.
Unless of coarse it is weapon that has a separate projectile for high angles. Anyway if you want to continue this I suggest you PM me.
but to get back to the original discussion: the brummbär is potent enough w/o manual targeting but can greatly benefit from that extra bit of micro in some situations. i see no issue with this at all; a lot of other units do as well and for me this is a very rewarding gameplay aspect. it would be a problem if the brum were completely useless using its auto attack only, but you'd have to be pretty delusional to claim that in the first place.
The autor-fire performance of the Brummbar depends on that target size and of its speed.
For instance against a ourah conscripts squad a first shot has a good chance of not killing a single entity.
Lets take (a rare) hypothetical scenario with bad parameters for he Brummbar to explain:
a Brummbar moves in range perpendicular to 7 men conscript squad and thus select as target the entity on the edge, the conscripts see the brummbar approach and uses "ourah" that shot would probably not do allot of damage.
Is the auto-fire completely useless? definitely not
Is there a large gap between manual and auto aim? under certain conditions, (not static basically) I would say yes.