The .338 Federal is a rifle cartridge based on the .308 Winchester case necked up to .33 caliber.

It was created by Federal Cartridge and Sako in 2006 and intended as a big-game cartridge with reasonable recoil for lightweight rifles.

[3] .338 Federal can use SR-25 pattern magazines but requires to further modification [4] The .338 Federal was designed by Federal Ammunition and it is a SAAMI standardized cartridge that was released in 2006.

In the table below is a comparison between the .338 Federal and the older .358 Winchester, another cartridge based on the .308 Winchester.