10.15x61mmR

The 10.15x61mmR cartridge was developed for use in the Norwegian Jarmann rifle. It is a rimmed, centerfire cartridge, and was initially loaded with black powder and a lead bullet wrapped in paper. Later cartridges were loaded with smokeless powder and had a lead bullet coated in steel (Full metal jacket, or FMJ).

The earliest version had a load of 4.46 g of blackpowder, and a projectile weighing 21.85 g. This gave a muzzle velocity of 500 m/s. The later version, with a full metal jacket, was loaded to produce the same muzzle velocity.

All in all, more than 3 million cartridges were manufactured for military use in Norway, as well as more than 2 million ordered from abroad. The majority of these were sold with the Jarmann rifles when the Norwegian Army introduced the Krag-Jørgensen.

The following variations on the 10.15x61mmR cartridge have been identified:

• 10.15 Ball, rounded tip, lead bullet wrapped in paper, black powder (possible just used for tests)
• 10.15 mm Ball, flat tip, lead bullet wrapped in paper, black powder
• 10.15 mm Ball, flat tip, full metal jacket, smokeless powder
• 10.15 mm Gallery, round lead bullet (for use indoor / short rangers)
• 10.15 mm Gallery, same as above but with a ring crimped around the neck of the case
• 10.15 mm Blank, unpainted wooden 'bullet', smooth case
• 10.15 mm Blank, same as above but with six long ridges pressed into the case
• 10.15 mm Blank, same as above but with six long ans six short ridges pressed into the case
• 10.15 mm Dummy, red wooden......
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