.416 Barrett

The .416 Barrett or 10.6×83mm centerfire rifle cartridge is a proprietary bottlenecked centrefire rifle cartridge designed in 2005. It is an alternative to the .50 BMG in long-range high-power rifles. Wikipedia
 
Bullet diameter.416 in (10.6 mm)
Case length3.27 in (83 mm)
Case capacity200 gr H2O (13 cm3)
Neck diameter.465 in (11.8 mm)
Overall length4.58 in (116 mm)
Base diameter.797 in (20.2 mm)
Shoulder diameter.732 in (18.6 mm)