The 9.3×62mm (also known in the USA as the 9.3×62mm Mauser) is an ‘all-around firearms cartridge’ suitable for hunting larger species of animals in Africa, Europe, or North America. It was introduced by Otto Bock in 1905. At a typical 720.0 m/s (2,362 ft/s), its 286 grain standard load balances recoil and power for effective use at up to about 250m (275 yds). The CIP Maximum Average Pressure (MAP) for the 9.3×62mm is 390 MPa (56,500 PSI). 
The 9.3×62mm was developed around 1905 by Berlin gunmaker Otto Bock, who designed it to fit into the Model 1898 Mauser bolt-action rifle.  African hunters and settlers often chose military rifles for their reliability and low cost, but governments fearful of colonial rebellions often banned military-caliber bolt-action magazine rifles and their ammunition. The 9.3×62mm was never a military cartridge and so never had this problem. Mausers in 9.3×62mm were inexpensive and reliable, too, so their popularity in Africa grew quickly and became widespread.
The 9.3×74R is a rimmed 9.3 mm cartridge that evolved from the 9.3×72R black powder cartridge. The energy levels of the 9.3×62 and 9.3×74R cartridges are similar but in developmental terms are distinct as the cartridges are unrelated. The rimmed cartridge is slightly longer, allowing for lower pressure in the case while retaining muzzle velocity.