Developed in Finlandicon by necking down the military 7,62x53r cartridge to use a 6,3 mm bullet
(SAKO loading was 70gr bullet at 2936 fps) and used for long range bird hunting. They shot the birds on the ground not in flight and also used on small game.

Manufactured by Lupua and SAKO with the 6,3x53r headstamp until the early 1970's.

Russians also used their own 6,3x53r cartridge with a more powerful loading