CO2
I have a CO 2 unloader, but use it for emergency, like if the powder gets fouled and Will not shoot. You still need to clean the gun, so I don't see a great advantage from just shooting it. However, if , for some reason, you get fouled, they get rid of the load in a very safe manner. Tried it out, and it worked good, but I have not needed it for emergency purposes yet. One time will make it worth having.