"The Dragunov bears a close resembelance to the AK series of weapons, but it has been extensively re-engineered to meet the demands of the sniping role. It is semi-automatic, but the gas system works with a short stroke piston, rather than the AK's long stroke to improve accuracy.[...] It has a first shot range of around 1000m and it is able to achieve this range by swapping the AK's 7.62mm Short cartridge for the older rimmed 7.62x54R cartridge, the ancestry of which stretches back to the late 19th century". Twentieth-Century Small Arms
See? For you it probably doesn't sound like much though, but I guess you'll understand the day your father lets you touch his squirrel gun.