9.5×57mm Mannlicher–Schönauer

Whether the development of the 9.5×57mm Mannlicher–Schoenauer cartridge originated with OWS or with Holland's British competitor, Westley Richards certainly was the principal promoter of the new 1910 Model Mannlicher–Schoenauer rifle as evidenced by catalogs of the time.

It was superior to the well-established British .375 Flanged Nitro Express, which only developed about 1950 to 2000 fps with the same weight of bullet, and trod closely on the heels of the well-regarded .400/350 Nitro Express and .400/360 Westley Richards cartridges, howbeit these benefitted from a bullet weight of significantly greater sectional density.

The recoil energy of 30 ft⋅lbf (41 J) from this combination is about 50% more than an average American .30-06 rifle, but light by the standards of other African game cartridges such as the .375 H&H Magnum.

Ammunition and arms catalogs of the era describe a standard loading of a 270 gr "metal-covered" (i.e., jacketed) soft nose bullet.

Although the 9.5×57mm MS was considered light for three of the “big five” in Africa (elephant, cape buffalo, and rhinoceros), it could handle any thin-skinned game including the dangerous ones.

The 9.5x57 Mannlicher Schoenauer in the model 1910 rifle was considered by some African guide-hunters to be an ideal lion gun and cartridge combination in the years just prior to World War I.

[citation needed] Finn Aagaard recorded that the 9.5x57 Mannlicher Schoenauer remained popular with settlers in Kenya in the 1950's and 60's for general plains game hunting.