>>5434117For the main gun. A good tank should be an all rounder and honestly, if all we can do right now is the Battle Cannon we should stick with it. Even later when the Vanquisher gets invented/rediscovered, it only does 1 attack vs the Battle Canons D6, so its less likely to hit. there are a lot of other tank weapons on the Imperial/Mechanicus/Astartes list but they tend to have drawbacks compared to the Battle Cannon like low range, fewer attacks, or such.
However, if we have an opportunity to invent, I posit two things we could do for something theoretically universally better than the battle cannon:
-Invent the Lancer Laser Destroyer, and twin link it (somewhat feasible, we did invent the Magnificat so what else of Cawls feats can we do?)
-Take the Deimos Predator's Magna Melta Cannon, and attempt to double it's range by creating the first Beamer Melta
Either of these would result in a gun that has the same range as the Battle Cannon, similar or better attacks, and much better AP capability.