The roll crimp on a slug presents a challenge for the slug to overcome, but years ago I remember seeing a cobbled-together, homemade kinetic puller fashioned for shotgun that consisted of a hardwood board with a hole drilled that just allowed the shell body to pass thru but the rim stopped it from passing all the way thru. Then a simple swinging lever of flat steel was swung over the shell head {one screw attaching it to the board} to keep the shell from falling out of the board as it is lifted to strike.

The board was then swung to strike an anvil {contacting the wood, not the shell!}, with the contents of the shell being caught in a container like a bowl or coffee can, etc. As with all kinetic pullers, I suspect trial and error gives the user the idea of how much effort to give to unseat the bullet without making a mess of things or otherwise breaking the puller. I am not sure what effect all this would have on the roll crimp. I'm thinking that time and careful, creative engineering should make for a useable tool that would result in a reloadable case.

I emailed the slug company. I'm holding my breath...