I have a witch character whose spells have to be written down and touching whatever she wants to effect. I'm trying to come up with a plausible way for her to get these spells into bad guys.
My first thought was etching the bullet directly, but I'm not sure if that would be possible or not. The bullets would have to be the type designed not to exit the body, so they would deform rather a lot when they hit, wouldn't they? The etching wouldn't have to take up the whole bullet, though--the technology to etch it within an extremely small space, like a square of 1/10 inch. (Sure, it'd be a pain in the butt to have them made, but they'd only be used for special occasions...)
And the problem of deformation aside, what about the rifling of the gun barrel? If she had a gun made without them, would it effect accuracy too much?
My other thought was that she could have them written on something similar to the infamous microdot (but on some highly heat-resistant, tough future material), and put inside the bullet as they were being cast. But the etching is cooler ... and I would think, cheaper.
It'd be easier if she could just shoot darts, but the bad guys could rip those off. XD