Would it be possible to make ammunition for railguns and gauss rifles that would degrade over time either through a natural process or by the means of star radiation, so the missed shots don't endanger future space traffic? Hopefully turning into something less harmful after leaving the star system.
I was thinking about some kind of a carbon composite with enough iron mixed into it to keep the ammunition magnetic and with enough mass to keep the ammo effective. I know that carbon is tough and can be shaped, not to mention the wide variety of materials that are made from it, plastics, cellulose, diamond etc. The projectile would degrade over time, eventually crumbling to smaller, less harmful, pieces and eventually to dust. Similar to plastics, but it would have to be much faster.
Another option that came to my mind is to compress some kind of a dust mixture and use that. it could contain some kind of a charge or maybe just some volatile or unstable materials that would do the trick after a some distance.
What sort of materials do we have now that we could use so that the future railguns don't fire back at us after turning around some massive space object?
Although it would be probably rare. a galaxy wide civilizations could encounter this problem eventually. We usually try to make things last, so this would be opposite to what materials are in demand for now. But I am still curious what are our options.