Our strategy for Ragnahog level 6 is shown in the video below.
Fire Red into the nearest top structure and watch the axe fall. The chain reaction should take out most of the left side. Next, lob Chuck upwards, activating near apogee, cutting the ropes and freeing Chuck II. A well timed lob of the second Red goes through one pig and into the last. The last two birds gave us a 20K bonus for a nice tidy 100130 and three stars.