Can anyone give me more information on these tool cartridges? The only clue is the molded headstamp “AMP” plus a “0” on the blue one and a “K” on the pink one.
Doing a Google search turned up a “AMP Rail Cable Co.” They make all kinds of electical connectors for the rail industry.
I would guess these are for some type of heavy duty cable clamp tool. They evidently fit into a device that fires them from the mouth end. They have a shotgun style primer set deep inside the case facing the open mouth. The blue one has been fired which, as can be seen seen, punchs a small hole in the head.