On my desktop game at home ive been doing this with size 16 missiles on my mostly beam battleships. 6msp to warhead (36 damage) 8 to engine. .005 to fuel, and the remainder to agility also i do the same thing minus an engine, traded for an msp of active sensor.
Sail in close range as the dozen gauss cannons the ship has eat all the missiles coming in. Close to 200kkm, let go with the 16s, watch as a number of gaping holes appear in all the enemies armor, pass a bit closer and finish them off with my 30cm plasma carronades.