There are some of both, some are just a launch tube for a rocket, and some have a kicker charge to fire them out of the tube, then ignite the rocket in flight.
For the most part, they don’t. They dont have to be particularly accurate to hit a tank or a building.
Translating that to cataclysm though, it’s a hard sell to put a bunch of resources into a wildly inaccurate projectile weapon.