Back when i first got my Cobra, selling the starting Sidewinder, which i regret (not selling ships since and quadruple thinking before buying one, if i'm ever going to use it, if i have a right name, if it's a right day, and still having a couple of without-a-clear-purpose-yet ships), i remember i equipped it with rail guns - idk why, just picked them. All weapons were looking more or less a wunderwaffle for me back then, except of seeker missiles, which i remember since my first Elite experience on ZX Spectrum, and that was my first whoah there, look, a rocket, and it follows the target even if it's going away. I was rather young and i wasn't rly understanding the game i think. But i do remember also another whoah like, you can buy gold cheap here and sell it for a higher price somewhere else, wow. And they got slaves there also, criminals. That mainly resumes my experience, i apparently wandered elsewhere, which i regret again.
Being back to the rail guns, i don't think i properly tried them back in Cobra, but i remember the feeling they do need some focus, and also that they need to actually hit the target. An enginered long range gimballed TV beam though doesn't need that, and sometimes even saves you from moving too much. That's clearly my take. But shooting something with that beam tears the target's shield and then is pretty slowly chewing through the hull. And 4 seeker missiles ain't helping much really. If target is small, it can work with a reasonable ammo use, but in such case you're kind of fine with just killing it with laser for free. I went with multis, but apparently wasn't that good at aiming again, then tried cannons - it looked much nicer especially for a bigger target. Or i got better at aiming, was quite a while between those two. Currently i've set the ship with 4 frags, but never yet tried in action. Could be that next testing step can be rails then.