If you are contemplating building a powerful coil gun, my blog would be a good place to find ideas and maybe a few pointers. If you are interested to see how we developed what we have and how we got there I would recommend starting
here. Start at the bottom and read the posts in backwards order. If you like to kill the suspense you can start
here and then read older posts to see where we came from. the observant will notice that this whole thing came together in less than a year. You wont find any calculations or much reasoning behind why we did what we did but if you make a comment I would be able to explain things to those who are interested. Here's a quick teaser picture of how powerful it was 6 months ago.(it shoots a .5"x2" bolt)