.444 Marlin

The .444 Marlin is a rifle cartridge designed in 1964 by Marlin Firearms and Remington Arms. It was designed to fill in a gap left by the older .45-70 when that cartridge was not available in any new lever action rifles; at the time it was the largest lever-action cartridge available. Wikipedia
 
Rifling twist1-38" (Microgroove) or 1-20" (Ballard cut)
Bullet diameter.429 in (10.9 mm)
Case length2.225 in (56.5 mm)
Rim diameter.514 in (13.1 mm)
Neck diameter.453 in (11.5 mm)
Base diameter.4706 in (11.95 mm)
Overall length2.55 in (65 mm)