The short neck was thought to hinder accuracy because it would prevent the alignment of cartridge to the bore, but this is rarely an issue either today or when the cartridge was designed. Energy Its not just a matter of which caliber goes faster we also want to analyze how much energy the bullet hits its target with at long distances. [34] However, by the time Winchester got around to designing their own .300, the .308 Norma Magnum and the .30-338 were already on the scene. Use this ballistic calculator in order to calculate the flight path of a bullet given the shooting parameters that meet your conditions. loading brass has a wide variety of options ranging from 130 up to 210 grain bullets such as Scirocco, We offer a 100% Authenticity Guarantee on all products sold on our website.