Shotgun Shell

A 1:1 replica of a shotgun shell. Modelled after Challenger 12 gauge. Layer change at 11.3mm, or at the smaller cylinder. I designed it for cosplay, but it will feed and eject out of a shotgun, but won't load multiple. I am not a firearms person (i cant really be, i live in Canada, stupid government) so i don't know why it does ('nt do) this. But if anybody knows why it won't feed and how i can fix it, I would like to know.