CLICK HERE to access the Hunting Products page on Norma’s website. There, on the left, you’ll see a vertical list of 58 different cartridges. Click on any cartridge name and you’ll see an illustrated “overview”. For most (but not all) listed cartridges, there is also a gray tab labeled “Caliber History”. Click that tab to see a cartridge diagram and a few paragraphs explaining the cartridge’s lineage and design features. For example, the .280 Remington Caliber History explains: “This cartridge was constructed in 1957 for Remington’s model 740 Autoloader. It is basically a .30-06 necked down to accept 7mm bullets, but the shoulder was moved forward a little in order to prevent the cartridge from being loaded into .270 Win. rifles by mistake.” Many of the Caliber History entries offer recommended bullet weights and barrel twist rates. Shown below is the 6.5×55 Swede’s Caliber History: