Maybe you should try and shorten down the topic title. You can write the question in the first post.
Edit: this should probably be on the mistborn discussion page. It's not really an RP
I'd go with a spinner (chronium ferring). I'd store fortune, then use it when the lawman gets close to 'luckily' escape or kill him against the odds. I considered atium misting, but atium is a pain to come by. Once you have a metalmind, you're set until you fill it or lose it.