From Wikipedia, the free encyclopedia:
Mannlicher-Schönauer is a 6.5mm (.264" cal.) rifle cartridge used in
the Mannlicher rifle. 6.5mm bullets are typically known
for their high ballistic coefficients and sectional density, which
gives them great stability in flight, resistance to wind deflection,
and excellent penetration.
Among professional elephant hunters of the 19th and 20th centuries, Walter Dalrymple Maitland "Karamojo" Bell, who shot more than 1,000 elephants in the period 1895-1930, had a very high regard for the 6.5mm Mannlicher-Schoenauer, and had Daniel Fraser of Edinburgh, Scotland build him a special, lightweight rifle in that calibre. He only set it aside when he was unable to acquire dependable ammunition for it, and turned to a .275 Rigby Mauser magazine rifle instead. The .275 Rigby cartridge is interchangeable with the 7 x 57 mm Mauser. Bell's legendary name has remained closely linked with the 7mm Mauser, but the 6.5 Mann.-Sch. was his first preference.
A modern cartridge, the 6.5mm Grendel very closely duplicates the ballistics of the 6.5 mm. The American cartridge, the .257 Roberts also demonstrates many of the virtues of the 6.5 x 54mm. The .257 Roberts was originally designed as a wildcat cartridge by Ned Roberts, and is based on the 7 x 57mm cartridge. Note that the 6.5 x 54mm shoots a .264" bullet.
The 6.5 x 54mm was referred to by the writer Ernest Hemingway as the .256 Mannlicher. Though it never replaced his favorite 30-06 Springfield, he did speak highly of it as a lion cartridge, and it was the favorite of his African guide and professional hunter Phillip Percival. The Kenya game warden and naturalist A. Blaney Percival also favored the 6.5 x 54mm.
In part, the 6.5 x 54mm's reputation stems from its use of a 160-grain (10 g) bullet, giving the projectile very high sectional density and therefore penetrating ability. It requires a fast rate-of-twist rifling (about 1 in 9") to stabilize such a long bullet."
6.5x54mm Mannlicher. (2009. February 27). In Wikipedia, The Free Encyclopedia. Retrieved 00:20, March 18, 2009. from http://en.wikipedia.org/w/index.php?title=6.5x54mm_Mannlicher-Sch%C3%B6nauer&oldid=273590807