Ian goes over the first iteration of Auto Mag 180
The newest reincarnation was announced but so far there has been no progress in actual production.
The cartridge itself was specifically mentioned in movie "Beverly Hills Cop II". Axel Foley(Eddie Murphy) went to Beverly Hills Gun Club to ask about .44 Automag case. The conversation included how the case is made from .308 Winchester case. However, the movie also made mistake of claiming that the gun was out of production due to expensive price.
From: Forgotten Weapons