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DYI;

By that do you mean that some form of inverse square law applies to magnetism?

I've always wondered if you used two different steels in the BBs if the basic magnetic gauss gun might work a bit better. Stainless steel and chrome steel BBs for example. Put the stainless nearest the magnet and the chrome steel next. Decent grades of stainless steel are only weakly attracted to a magnet, chrome steels are usually strongly attracted to magnets.

A chrono is easy, just record the sound of the gun firing with a PC.

Performance of the basic SciToys type gun is less than stellar. Figure maybe 5 joules max?

http://www.inpharmix.com/jps/Gauss_rifle.html

DYI wrote:Note to moderators: the syntax of the above appears to be correct, but it's not acting like it should...

<a href="http://translate.googleusercontent.com/ ... Q">Link</a>. BBCode formatting gets funny if there are certain symbols in the web address. Spudfiles allows HTML, so it's fixable with A HREF.