Missiles use contragravity thrusters that are set to overload, like a Star Trek phaser?
Man that one is going in the book.....
IIRC, 6G6 is 18 G-hours of thrust (6G for 6 30 minute turns, right?)
That really depends of what iteration of which rules you read last, but what you said works for the last rev of jTas's Special Supplement 3: Missiles for CT.....