I just throw the used cartridge downrange into the berm.
Bad ammo is not necessarily dangerous, the only reason your bullet moves fast is that the detonation of the primer causes the powder to burn, gas pressure builds up, the case is contained withing a chamber to control pressure changes in the brass, the bullet leaves the case with ever expanding gas behind it to build velocity and the bulet leaves the barrel.
A cartridge by itself is unable to build up sufficient pressure to move the bullet with any great speed, in actuality the cartridge just kinda explodes with a 'POP'.
Bombs are different....Live rounds are different. Just think how many live rounds of ammo are distributed throughout the world, let alone Iraq. Cars, tanks run over em and they get crushed.
You don't really have the proverbial 'hot potato' on your hands.