|Place of origin||Austria-Hungary|
|Used by||Austria-Hungary, Kingdom of Bulgaria, Kingdom of Italy|
|Wars||World War I, World War II|
|Designed||1890 (M. 90)|
|Parent case||8×52mmR Mannlicher|
|Case type||Rimmed, bottleneck|
|Bullet diameter||8.15 mm (0.321 in)|
|Neck diameter||9.03 mm (0.356 in)|
|Shoulder diameter||12.01 mm (0.473 in)|
|Base diameter||12.48 mm (0.491 in)|
|Rim diameter||14.11 mm (0.556 in)|
|Rim thickness||1.38 mm (0.054 in)|
|Case length||50.38 mm (1.983 in)|
|Overall length||76.21 mm (3.000 in)|
|Test barrel length: 30|
The Austro-Hungarian 8×50mmR Mannlicher or 8×50mmR M93 is a service cartridge dating back to the days of semi-smokeless powder. It was later replaced by (and many weapons were rechambered for) the 8×56mmR cartridge.
Note: This cartridge should not be confused with the French 8×50mmR Lebel cartridge.
In approximately 1890, the Austro-Hungarian Empire converted the older, black powder filled 8×52mmR Mannlicher round into a semi-smokeless cartridge, following upon the heels of France's 8 mm Lebel cartridge, the first smokeless military round. This new round was designated 8mm M.1890 scharfe Patrone or "nitro-Patrone". It was loaded with the same 244 gr bullet but carried a 43 gr charge of "Gewehrpulver" ("rifle powder", Austria-Hungary's name for their version of smokeless powder, which was actually a "semi-smokeless" powder). The new semi-smokeless loading pushed the bullet to a velocity of 1,950 ft/s (590 m/s) in the converted M.88/90 and M.86/90 Mannlicher rifles.
In 1893 the loading was once again updated with the perfection of a completely smokeless powder by the Austro-Hungarians. This new loading was designated "8mm M.1893 scharfe Patrone", it was loaded with the same bullet as the two previous loadings but used a 43 gr charge of the new Gewehrpulver M.1892. This improved ballistics slightly to 2,035 ft/s (620 m/s) out of the M.88/90 and later M.95 long rifles, it was about 200 ft/s (61 m/s) less out of the repetier-carabiner M.90 and M.95.
The IOF.315 Sporting Rifle uses this cartridge under the title of .315.
The 8×50mmR Mannlicher cartridge has a long history of sporting use in India, as it was a simple matter to modify the Lee-Enfield action to accommodate the 8×50mmR in place of the .303 inch cartridge, thus providing a solution to the British colonial administration's ban on civilians possessing rifles chambering British military cartridges while offering a cartridge of similar capabilities.
British gunmakers BSA produced sporting versions of the Lee-Enfield military rifle, chambered in "8mm (.315")" from well before World War I until at least the 1930s. The British-founded "Rifle Factory Ishapore" continues to manufacture Lee-Enfield sporting rifles in this chambering.
Reloadable cartridge cases can be produced by reforming and trimming 8×56mmR Mannlicher or 7.62×54mmR Mosin-Nagant Russian brass. Standard .323" 8mm S-bullets are correct for this caliber though best results are obtained from open-base bullets that can expand to fit the .329" bore. RCBS offers both reforming and reloading dies.
When reloading for "wedge-lock" Mannlicher rifles such as the M.88, M.86/88, M.86/90 or M.88/90 chamber pressures should be kept low for safety. Rifles such as the Mannlicher M.95 using a stronger rotating-bolt design can be loaded to higher pressures.