338 Norma Magnum ammo is a very young cartridge, practically a baby, as it was only designed in 2008 and put into production in 2009. It was designed off its parent case, the 416 Rigby. 338 Norma is an upgrade and enhancement of the more popular 338 Lapua Magnum round. The round offers a significant performance increase over the 338 Lapua and just barely meets the definition of a wildcat (not quite mainstream) cartridge.