i am new to FTB, only played about a few days, and been messing around in creative. today this is what i made... a TNT cannon that uses nukes as the projectiles. the cannon has great range and beautiful damage but after a few shots it now crashes FTB... that said its much easier to use Nukes as the cannonballs, you just wire it so they all set off on the same redstone pulse, the longer fuse on the nukes gives plenty of flight time!