i won't be able to finish the challenge as i have a Demoreel due next week. http://cgtalk.com/images/smilies/wink.gif
Last week i was so sick of it for a day that i started the FX Challenge, i ran into quite some weird results in the dynamix part (what i focused on due to tha lack of time and me sucking big time at modeling). It took me a while to figure out which right rigid body constraints to use, then it was quite easy (basic part)... So this is what i came up with, no keys except for the release of the bullet.
The Lever is 40 units long, shot distance is 1100. Weight mass is 1500, Bullet mass is 5.02 (tweaked to hit the target...).
Hope you like it.
I enjoyed the challenge and learned a lot.