https://en.wikipedia.org/wiki/Coilgun
Google search for "coilgun" leads to some attempts to make coilguns.
How far has development of coilguns advanced, in terms of?:-
* Power / range / ability to make a hole in things
* Weight and bulk, including onboard power supply / battery
* How many shots per minute from one gun
* How long from switching the gun on to first shot
I found this list of attempts to make coilguns:
http://www.coilgun.ru/
(Google search result for "gauss rifle" (in quotes) is grossly cluttered with videogame matter.)