[@OfWindAndRain] Actually space warfare is a logistical nightmare even to an advanced society at the peak of fusion energy sciences. The best methods of propulsion end up being more controlled Orion drives that shoot out deadly radiation(Thus engines can be just as much of a weapon as anything else). Most options of capable combat craft turn to drones since habituated vessels have too little Delta-V. And Vast distances take so long to cross, interplanetary warfare is chess played out in days to months with advanced propulsion, with Interstellar being epics of hundreds of years if not thousands(This is paying mind to the absence of FTL).

It takes so little delta-V to change into non-collision courses in space, making missiles the king of combat, and lasers the king of CIWS. Projectile weapons would probably be fore-thoughts, and gambits in combat to say the least. 20mm railguns used to puncture holes into other lightly armored ships wouldn't be unheard of. BUt hey this rp is about fun, big guns, war, and drama so. ^^

The reason why my society uses alot of hybrid cannons, to just plain cannons is experience in fighting against EMP weapons, ECM suites, and whatnot. Not to mention if the power package is lost, good ol' gunpowder doesn't need anything to go off but a primer and striker.