One of the oldest smokeless military rounds, 
the 7x57mm was introduced in the 1892 Mauser 
rifle, developed by Paul Mauser.  The Mauser 
rifle and cartridge was so effective against 
American forces in the Spanish-American War, that 
the U.S. 1903 Springfield rifle was derived from 
the Belgian design.

    While many Mauser-actions can withstand 
pressures of 50,000+ c.u.p, these early rifles 
were only designed to handle a maximum of 45,000 
c.u.p.  American ammunition manufacturers have 
responded by offering quite conservative factory 
7mm loadings.  As with the 8x57mm cartridge, 
European cartridge makers offer much livelier 
7x57mm ammunition than their American 
counterparts.

    The handloader should be conservative if 
loading for an original-issue 7x57mm military 
rifle, saving higher-pressure experimentation for 
rifles of modern construction.  As always, 
approach maximum loads slowly.

    Current factory offerings include a 145 grain 
bullet with a muzzle velocity of 2690 fps.