Does a Iver Johnson 410 take 45 long colts?

No, an Iver Johnson .410 shotgun does not take .45 Long Colt cartridges. The .410 is a shotgun gauge specifically designed for shotshells, while .45 Long Colt is a rimmed pistol cartridge. These two types of ammunition are not interchangeable due to their differing chamber specifications and intended use. Always consult the manufacturer's guidelines for specific firearm and ammunition compatibility.