Long-range modded High-Yield Cannon
Really? The cannon rounds are so slow, I can't imagine bothering with long range. I've actually liked the short-range mod. Get right in someone's face and blast em.
The projectile speed scales with the range.
wow I did not know that. Where did you learn that?
Torpedo. Obviously. And the ship itself. RAMMING SPEED!
I've seen a few combat haulers...often quite tough to destroy, but they don't have much in the way of offensive capabilities.
I second the railgun suggestion...though you still shouldn't expect to actually shoot anyone down, unless you get extremely lucky.
Fully equipped Hauler is about 30 tons. You can't even ram SLFs to death with it.
And one torpedo will only take out unmodfied, shieldless, small vessels...if you can land the hit.