6.5×55mm Swedish

The 6.5×55mm Swedish is a first-generation smokeless powder rimless bottlenecked rifle cartridge. Other common names for this cartridge include 6.5×55mm and 6.5×55mm Swedish Mauser and less commonly 6.5×55mm Mauser and 6.5×55mm Krag. Wikipedia
 
Rifling twist220 mm (1-8.66 in)
Bullet diameter6.71 mm (0.264 in)
Case length55.00 mm (2.165 in)
Case capacity3.75 cm3 (57.9 gr H2O)
Base diameter12.20 mm (0.480 in)
Overall length80.00 mm (3.150 in)
Shoulder diameter11.04 mm (0.435 in)