what is a 30-06
Both are 30 calibers. 30/06 means it is 30 caliber and it was made in 1906. 30/30 means it is a 30 caliber bullet using 30 grains of powder.However with modern-day loads the grains of powder is usually different.he .30 in both is the cartridge's bullet diameter (.308 inches). The 06 in .30-06 stands for 1906, the year in which the cartridge was adopted by the US Army.