The .45-70 rifle cartridge, also known as .45-70 Government, was developed at the U.S. Army's Springfield Armory for use in the Springfield Model 1873, which is known to collectors as the "Trapdoor Springfield." Wikipedia
Bullet diameter.458 in (11.6 mm)
Case length2.105 in (53.5 mm)
Rim diameter.608 in (15.4 mm)
Overall length2.550 in (64.8 mm)
Base diameter.505 in (12.8 mm)
Neck diameter.480 in (12.2 mm)