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Name that round

OK too much guessing.

Haerens Laboratorium (HL) 11.6X40 R Danish Greenland rifle cartridge.

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This cartridge was created to extend the useful life of Remington 1867 Rolling Block rifles after the Danish Army replaced them with more modern guns. Many of the rifles were sent to Greenland for use as hunting rifles. Since production of the original 51mm military cartridges had ceased Greenland hunters acquired 9X58R Krag-Jorgensen M2889 military brass and cut them just below the shoulder to work in the old rifles, Like almost all of these cartridges, this one is made from a Danish Arsenal made cartridge case, uses a single groove lead bullet, and contains black powder.

The next one will be easy, for some....
 
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10mmLife said:
Or maybe .50 Tround
Click to expand...

You win!

It's a Dardick 50 Caliber Experimental Machine Gun Tround (triangular round) functional dummy cartridge. This is a rare relic of an experiment that started in the 1950s and continued through the 1980s that has been referred to as "a solution in search of a problem". This system was developed by David Dardick and was aimed at simplifying the gun feeding mechanism. The basic idea was to push the cartridges sideways into an open chamber instead of lengthwise into a closed one. Three of these chambers were formed on the outside of a revolving cylinder; at any given moment, one round was being loaded, the second fired and the third ejected. The cylinder was partly surrounded by a fixed sleeve; this left two chambers open for loading and ejection but supported the round being fired by providing the third side of the chamber. Most of the initial effort was in small arms with a few examples being made for commercial sale, but these were not successful and production stopped in the 1960s. However, interest in larger-caliber automatic versions continued, mainly because the short cartridge movements involved in chambering and ejection permit a very smooth action with an extremely high rate of fire. Experiments with a .50 caliber Tround continued into the early 1990s but did not result in a production gun.

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Talyn said:
You win!

It's a Dardick 50 Caliber Experimental Machine Gun Tround (triangular round) functional dummy cartridge. This is a rare relic of an experiment that started in the 1950s and continued through the 1980s that has been referred to as "a solution in search of a problem". This system was developed by David Dardick and was aimed at simplifying the gun feeding mechanism. The basic idea was to push the cartridges sideways into an open chamber instead of lengthwise into a closed one. Three of these chambers were formed on the outside of a revolving cylinder; at any given moment, one round was being loaded, the second fired and the third ejected. The cylinder was partly surrounded by a fixed sleeve; this left two chambers open for loading and ejection but supported the round being fired by providing the third side of the chamber. Most of the initial effort was in small arms with a few examples being made for commercial sale, but these were not successful and production stopped in the 1960s. However, interest in larger-caliber automatic versions continued, mainly because the short cartridge movements involved in chambering and ejection permit a very smooth action with an extremely high rate of fire. Experiments with a .50 caliber Tround continued into the early 1990s but did not result in a production gun.

View attachment 4776
Click to expand...
That's an interesting back story!
 
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