The durable and reliable double-stacked Cartridge+ magazine of the Sako S20, with its longer maximum cartridge length, was built to support reloaders, safeguard the bullet and to ensure optimal feeding. The magazine is designed in a way that supports the cartridges by the shoulder, leaving some space in front of the cartridge tip in the case. This prevents bullet damage from recoil which can have a serious effect on the ballistics. With the S20, the shots stay precise, wherever your journey takes you. S Size = .243, .308, 6.5CM SM Size = 6.5PRC M Size = .270, .30-06 L Size = .300 Win Mag, 7mm Rem Mag