Convergence have very strong shooting, but in kind of weird ways. So they can do very shooty armies, but not very shooty in traditional ways.
In the faction, the two casters who shoot the best are Syntherion and Mother. Syntherion is a huge combined arms caster, and does everything well. His biggest thing is he wants jacks who can both shoot and melee, because his feat lets him do both.
Generally, tactics wise, he usually shoots the enemy as they come in, and then engages in melee once they get close, with the flexibility to focus on one or the other more based on your opponents lists.
Mother is the more straightfoward shooting caster, with a side of spell slinging. She buffs her warjacks ranges and her feat lets her do a shitload of work, as underwhelming as it first feels. She loves the Prime Axiom for this reason, because she's about weight of fire.
This is the full 75 point Mother list I'm considering running, going to be testing it out over the next week or so. It's got an armor cracking focus, especially against warmachine, but it can still handle anyone who decides to be cute and swarm infantry.