6mm Rem Ammo
Originally intended as a varmint and predator cartridge, the .244 was never factory loaded with bullets over 90 grains. Rifles marked .244 Remington have a 1 in 12-inch (300 mm) twist that may not stabilize the heavier 100 and 105 grain bullets.
Originally Remington offered factory rifle ammunition with 75 grain bullets for varmints and 90 grain for deer.
In 1963 Remington renamed the cartridge, calling it the 6mm Remington. Rifles marked 6mm Remington have a 1 in 9-inch (230 mm) twist and can stabilize most commercially available 6 mm bullets.